rgw_kms: fix Realloc and free cct

When sanitizer is enabled, unittest_rgw_kms shows,

```
=================================================================
==1415137==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 768 byte(s) in 1 object(s) allocated from:
    #0 0xaaaacb1381e0 in malloc (/root/ceph/build/bin/unittest_rgw_kms+0x4b81e0) (BuildId: 2005acbecb5cbd5bc928c98209bd613f20ecbacf)
    #1 0xaaaacb1ed768 in ZeroPoolAllocator::Realloc(void*, unsigned long, unsigned long) /root/ceph/src/rgw/rgw_kms.cc:84:14
    #2 0xaaaacb1ed728 in rapidjson::GenericMember<rapidjson::UTF8<char>, ZeroPoolAllocator>* rapidjson::Realloc<rapidjson::GenericMember<rapidjson::UTF8<char>, ZeroPoolAllocator>, ZeroPoolAllocator>(ZeroPoolAllocator&, rapidjson::GenericMember<rapidjson::UTF8<char>, ZeroPoolAllocator>*, unsigned long, unsigned long) /root/ceph/src/s3select/rapidjson/include/rapidjson/error/../internal/../allocators.h:437:30
    #3 0xaaaacb1ed4ec in rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>::DoReserveMembers(unsigned int, ZeroPoolAllocator&) /root/ceph/src/s3select/rapidjson/include/rapidjson/document.h:2260:34
    #4 0xaaaacb1ed2cc in rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>::DoAddMember(rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/s3select/rapidjson/include/rapidjson/document.h:2292:13
    #5 0xaaaacb1ec344 in rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>::AddMember(rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/s3select/rapidjson/include/rapidjson/document.h:1375:9
    #6 0xaaaacb19769c in void add_name_val_to_obj<rapidjson::UTF8<char>, ZeroPoolAllocator>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/rgw/rgw_kms.cc:149:5
    ceph#7 0xaaaacb197058 in void add_name_val_to_obj<rapidjson::UTF8<char>, ZeroPoolAllocator>(char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/rgw/rgw_kms.cc:169:3
    ceph#8 0xaaaacb1ac4a8 in TransitSecretEngine::make_actual_key(DoutPrefixProvider const*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, ceph::buffer::v15_2_0::list, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, ceph::buffer::v15_2_0::list> > >&, optional_yield, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) /root/ceph/src/rgw/rgw_kms.cc:485:5
    ceph#9 0xaaaacb188f88 in TestSSEKMS_test_transit_makekey_Test::TestBody() /root/ceph/src/test/rgw/test_rgw_kms.cc:192:29
    ceph#10 0xaaaacb34549c in void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2605:10
    ceph#11 0xaaaacb2f864c in void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2641:14
    ceph#12 0xaaaacb2aa958 in testing::Test::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:2680:5
    ceph#13 0xaaaacb2ac89c in testing::TestInfo::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:2858:11
    ceph#14 0xaaaacb2ade9c in testing::TestSuite::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:3012:28
    ceph#15 0xaaaacb2c9c60 in testing::internal::UnitTestImpl::RunAllTests() /root/ceph/src/googletest/googletest/src/gtest.cc:5723:44
    ceph#16 0xaaaacb34f310 in bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2605:10
    ceph#17 0xaaaacb2ff588 in bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2641:14
    ceph#18 0xaaaacb2c90d8 in testing::UnitTest::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:5306:10
    ceph#19 0xaaaacb250ae4 in RUN_ALL_TESTS() /root/ceph/src/googletest/googletest/include/gtest/gtest.h:2486:46
    ceph#20 0xaaaacb250a60 in main /root/ceph/src/googletest/googlemock/src/gmock_main.cc:70:10
    ceph#21 0xffff7cf773f8 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    ceph#22 0xffff7cf774c8 in __libc_start_main csu/../csu/libc-start.c:392:3
    ceph#23 0xaaaacb0c102c in _start (/root/ceph/build/bin/unittest_rgw_kms+0x44102c) (BuildId: 2005acbecb5cbd5bc928c98209bd613f20ecbacf)

Direct leak of 768 byte(s) in 1 object(s) allocated from:
    #0 0xaaaacb1381e0 in malloc (/root/ceph/build/bin/unittest_rgw_kms+0x4b81e0) (BuildId: 2005acbecb5cbd5bc928c98209bd613f20ecbacf)
    #1 0xaaaacb1ed768 in ZeroPoolAllocator::Realloc(void*, unsigned long, unsigned long) /root/ceph/src/rgw/rgw_kms.cc:84:14
    #2 0xaaaacb1ed728 in rapidjson::GenericMember<rapidjson::UTF8<char>, ZeroPoolAllocator>* rapidjson::Realloc<rapidjson::GenericMember<rapidjson::UTF8<char>, ZeroPoolAllocator>, ZeroPoolAllocator>(ZeroPoolAllocator&, rapidjson::GenericMember<rapidjson::UTF8<char>, ZeroPoolAllocator>*, unsigned long, unsigned long) /root/ceph/src/s3select/rapidjson/include/rapidjson/error/../internal/../allocators.h:437:30
    #3 0xaaaacb1ed4ec in rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>::DoReserveMembers(unsigned int, ZeroPoolAllocator&) /root/ceph/src/s3select/rapidjson/include/rapidjson/document.h:2260:34
    #4 0xaaaacb1ed2cc in rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>::DoAddMember(rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/s3select/rapidjson/include/rapidjson/document.h:2292:13
    #5 0xaaaacb1ec344 in rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>::AddMember(rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/s3select/rapidjson/include/rapidjson/document.h:1375:9
    #6 0xaaaacb19769c in void add_name_val_to_obj<rapidjson::UTF8<char>, ZeroPoolAllocator>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/rgw/rgw_kms.cc:149:5
    ceph#7 0xaaaacb197058 in void add_name_val_to_obj<rapidjson::UTF8<char>, ZeroPoolAllocator>(char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, rapidjson::GenericValue<rapidjson::UTF8<char>, ZeroPoolAllocator>&, ZeroPoolAllocator&) /root/ceph/src/rgw/rgw_kms.cc:169:3
    ceph#8 0xaaaacb1b2298 in TransitSecretEngine::reconstitute_actual_key(DoutPrefixProvider const*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, ceph::buffer::v15_2_0::list, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, ceph::buffer::v15_2_0::list> > > const&, optional_yield, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) /root/ceph/src/rgw/rgw_kms.cc:569:5
    ceph#9 0xaaaacb18abcc in TestSSEKMS_test_transit_reconstitutekey_Test::TestBody() /root/ceph/src/test/rgw/test_rgw_kms.cc:216:29
    ceph#10 0xaaaacb34549c in void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2605:10
    ceph#11 0xaaaacb2f864c in void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2641:14
    ceph#12 0xaaaacb2aa958 in testing::Test::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:2680:5
    ceph#13 0xaaaacb2ac89c in testing::TestInfo::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:2858:11
    ceph#14 0xaaaacb2ade9c in testing::TestSuite::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:3012:28
    ceph#15 0xaaaacb2c9c60 in testing::internal::UnitTestImpl::RunAllTests() /root/ceph/src/googletest/googletest/src/gtest.cc:5723:44
    ceph#16 0xaaaacb34f310 in bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2605:10
    ceph#17 0xaaaacb2ff588 in bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2641:14
    ceph#18 0xaaaacb2c90d8 in testing::UnitTest::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:5306:10
    ceph#19 0xaaaacb250ae4 in RUN_ALL_TESTS() /root/ceph/src/googletest/googletest/include/gtest/gtest.h:2486:46
    ceph#20 0xaaaacb250a60 in main /root/ceph/src/googletest/googlemock/src/gmock_main.cc:70:10
    ceph#21 0xffff7cf773f8 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    ceph#22 0xffff7cf774c8 in __libc_start_main csu/../csu/libc-start.c:392:3
    ceph#23 0xaaaacb0c102c in _start (/root/ceph/build/bin/unittest_rgw_kms+0x44102c) (BuildId: 2005acbecb5cbd5bc928c98209bd613f20ecbacf)

...
...

Indirect leak of 18 byte(s) in 1 object(s) allocated from:
    #0 0xaaaab6e3f148 in operator new(unsigned long) (/root/ceph/build/bin/unittest_rgw_kms+0x4ef148) (BuildId: 2005acbecb5cbd5bc928c98209bd613f20ecbacf)
    #1 0xffffac4a0fa0 in __gnu_cxx::new_allocator<char>::allocate(unsigned long, void const*) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/ext/new_allocator.h:127:27
    #2 0xffffac4a0f1c in std::allocator<char>::allocate(unsigned long) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/bits/allocator.h:185:32
    #3 0xffffac4a0f1c in std::allocator_traits<std::allocator<char> >::allocate(std::allocator<char>&, unsigned long) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/bits/alloc_traits.h:464:20
    #4 0xffffac4a0c1c in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_create(unsigned long&, unsigned long) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/bits/basic_string.tcc:153:14
    #5 0xffffac4a0618 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>(char*, char*, std::forward_iterator_tag) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/bits/basic_string.tcc:219:14
    #6 0xffffac4a0398 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct_aux<char*>(char*, char*, std::__false_type) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/bits/basic_string.h:255:11
    ceph#7 0xffffac4a00d0 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>(char*, char*) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/bits/basic_string.h:274:4
    ceph#8 0xffffac49fe0c in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/bits/basic_string.h:459:9
    ceph#9 0xffffacc9b490 in std::enable_if<((__exactly_once<std::variant_alternative<__accepted_index<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>, std::variant<std::monostate, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned long, long, double, bool, entity_addr_t, entity_addrvec_t, std::chrono::duration<long, std::ratio<1l, 1l> >, std::chrono::duration<long, std::ratio<1l, 1000l> >, Option::size_t, uuid_d> >::type>) && (is_constructible_v<std::variant_alternative<__accepted_index<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>, std::variant<std::monostate, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned long, long, double, bool, entity_addr_t, entity_addrvec_t, std::chrono::duration<long, std::ratio<1l, 1l> >, std::chrono::duration<long, std::ratio<1l, 1000l> >, Option::size_t, uuid_d> >::type, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>)) && (is_assignable_v<std::variant_alternative<__accepted_index<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>, std::variant<std::monostate, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned long, long, double, bool, entity_addr_t, entity_addrvec_t, std::chrono::duration<long, std::ratio<1l, 1l> >, std::chrono::duration<long, std::ratio<1l, 1000l> >, Option::size_t, uuid_d> >::type&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>), std::variant<std::monostate, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned long, long, double, bool, entity_addr_t, entity_addrvec_t, std::chrono::duration<long, std::ratio<1l, 1l> >, std::chrono::duration<long, std::ratio<1l, 1000l> >, Option::size_t, uuid_d>&>::type std::variant<std::monostate, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned long, long, double, bool, entity_addr_t, entity_addrvec_t, std::chrono::duration<long, std::ratio<1l, 1l> >, std::chrono::duration<long, std::ratio<1l, 1000l> >, Option::size_t, uuid_d>::operator=<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) /usr/bin/../lib/gcc/aarch64-linux-gnu/11/../../../../include/c++/11/variant:1477:26
    ceph#10 0xffffacc9298c in Option::parse_value(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::variant<std::monostate, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned long, long, double, bool, entity_addr_t, entity_addrvec_t, std::chrono::duration<long, std::ratio<1l, 1l> >, std::chrono::duration<long, std::ratio<1l, 1000l> >, Option::size_t, uuid_d>*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) const /root/ceph/src/common/options.cc:165:10
    ceph#11 0xffffacb813cc in md_config_t::_set_val(ConfigValues&, ConfigTracker const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Option const&, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) /root/ceph/src/common/config.cc:1395:15
    ceph#12 0xffffacb8f084 in md_config_t::set_val(ConfigValues&, ConfigTracker const&, std::basic_string_view<char, std::char_traits<char> >, char const*, std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*) /root/ceph/src/common/config.cc:930:13
    ceph#13 0xaaaab6ecb014 in md_config_t::set_val(ConfigValues&, ConfigTracker const&, std::basic_string_view<char, std::char_traits<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*) /root/ceph/src/common/config.h:180:12
    ceph#14 0xaaaab6e72464 in ceph::common::ConfigProxy::set_val(std::basic_string_view<char, std::char_traits<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*) /root/ceph/src/common/config_proxy.h:239:19
    ceph#15 0xaaaab6e53bf8 in TestSSEKMS_non_existent_vault_token_file_Test::TestBody() /root/ceph/src/test/rgw/test_rgw_kms.cc:84:14
    ceph#16 0xaaaab701549c in void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2605:10
    ceph#17 0xaaaab6fc864c in void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2641:14
    ceph#18 0xaaaab6f7a958 in testing::Test::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:2680:5
    ceph#19 0xaaaab6f7c89c in testing::TestInfo::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:2858:11
    ceph#20 0xaaaab6f7de9c in testing::TestSuite::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:3012:28
    ceph#21 0xaaaab6f99c60 in testing::internal::UnitTestImpl::RunAllTests() /root/ceph/src/googletest/googletest/src/gtest.cc:5723:44
    ceph#22 0xaaaab701f310 in bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2605:10
    ceph#23 0xaaaab6fcf588 in bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) /root/ceph/src/googletest/googletest/src/gtest.cc:2641:14
    ceph#24 0xaaaab6f990d8 in testing::UnitTest::Run() /root/ceph/src/googletest/googletest/src/gtest.cc:5306:10
    ceph#25 0xaaaab6f20ae4 in RUN_ALL_TESTS() /root/ceph/src/googletest/googletest/include/gtest/gtest.h:2486:46
    ceph#26 0xaaaab6f20a60 in main /root/ceph/src/googletest/googlemock/src/gmock_main.cc:70:10
    ceph#27 0xffffa99573f8 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    ceph#28 0xffffa99574c8 in __libc_start_main csu/../csu/libc-start.c:392:3
    ceph#29 0xaaaab6d9102c in _start (/root/ceph/build/bin/unittest_rgw_kms+0x44102c) (BuildId: 2005acbecb5cbd5bc928c98209bd613f20ecbacf)

SUMMARY: AddressSanitizer: 112735554 byte(s) leaked in 36910 allocation(s).
```

1. fix memory reallocate issue
2. free cct

Signed-off-by: Rongqi Sun <sunrongqi@huawei.com>

src/rgw/rgw_kms.cc

@@ -80,8 +80,8 @@ class ZeroPoolAllocator {
  return r;
  }
  void* Realloc(void* p, size_t old, size_t nw) {
- void *r = nullptr;
- if (nw) r = malloc(nw);
+ if (!nw) return 0;
+ void *r = Malloc(nw);
  if (nw > old) nw = old;
  if (r && old) memcpy(r, p, nw);
  return r;

src/test/rgw/test_rgw_kms.cc

@@ -56,6 +56,7 @@ class TestSSEKMS : public ::testing::Test {
  delete old_engine;
  delete kv_engine;
  delete transit_engine;
+ delete cct;
  }
 
 };