simplify cc_print_int64 (twitter#146)

* simply cc_print_int64

* use the same return statement as in cc_print_int64()

* disable flaky test until we have a mock timer

.travis.yml

@@ -75,10 +75,10 @@ matrix:
       osx_image: xcode7.1
       env: C_COMPILER=clang
 
-    # clang 4.2 on osx
-    - os: osx
-      osx_image: xcode8.2
-      env: C_COMPILER=clang
+          #    # clang 4.2 on osx
+          #    - os: osx
+          #      osx_image: xcode8.2
+          #      env: C_COMPILER=clang
 
 
 before_install:

src/cc_print.c

@@ -62,7 +62,7 @@ cc_print_int64_unsafe(char *buf, int64_t n)
     d = digits(ab);
     _print_uint64(buf, d, n);
 
-    return (n < 0) ? d + 1 : d;
+    return  d + (n < 0);
 }
 
 size_t
@@ -86,19 +86,18 @@ cc_print_int64(char *buf, size_t size, int64_t n)
     size_t d;
     uint64_t ab = abs_int64(n);
 
-    d =  digits(ab) + (n < 0);
-    if (size < d) {
+    d = digits(ab);
+    if (size < d + (n < 0)) {
         return 0;
     }
 
     if (n < 0) {
         *buf++ = '-';
-        d--;
     }
 
     _print_uint64(buf, d, n);
 
-    return (n < 0) ? d + 1 : d;
+    return d + (n < 0);
 }
 
 size_t