util test failed under i386

[lidaobing]

# ./builddir/src/iptux-utils/libiptux_utils_test 
[==========] Running 8 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 8 tests from Utils
[ RUN      ] Utils.FLAG_SET
[       OK ] Utils.FLAG_SET (0 ms)
[ RUN      ] Utils.numeric_to_size
../src/iptux-utils/UtilsTest.cpp:30: Failure
Expected equality of these values:
  numeric_to_size(1L << 40)
    Which is: "0B"
  "1.0TiB"
[  FAILED  ] Utils.numeric_to_size (1 ms)
[ RUN      ] Utils.inAddrFromString
[       OK ] Utils.inAddrFromString (0 ms)
[ RUN      ] Utils.stringFormat
[       OK ] Utils.stringFormat (0 ms)
[ RUN      ] Utils.stringDump
[       OK ] Utils.stringDump (0 ms)
[ RUN      ] Utils.stringDumpAsCString
[       OK ] Utils.stringDumpAsCString (1 ms)
[ RUN      ] Utils.ipv4Compare
[       OK ] Utils.ipv4Compare (0 ms)
[ RUN      ] Utils.utf8MakeValid
[       OK ] Utils.utf8MakeValid (0 ms)
[----------] 8 tests from Utils (2 ms total)

[----------] Global test environment tear-down
[==========] 8 tests from 1 test case ran. (2 ms total)
[  PASSED  ] 7 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] Utils.numeric_to_size