Merge pull request #474 from mroi/patch-1

[SR-10559] libdispatch fails to build with _FORTIFY_SOURCE=2

Author: ktopley-apple

src/internal.h

@@ -1046,14 +1046,14 @@ _dispatch_ktrace_impl(uint32_t code, uint64_t a, uint64_t b,
 		dispatch_assert(_length != -1); \
 		_msg = (char *)malloc((unsigned)_length + 1); \
 		dispatch_assert(_msg); \
-		snprintf(_msg, (unsigned)_length + 1, "%s" fmt, DISPATCH_ASSERTION_FAILED_MESSAGE, ##__VA_ARGS__); \
+		(void)snprintf(_msg, (unsigned)_length + 1, "%s" fmt, DISPATCH_ASSERTION_FAILED_MESSAGE, ##__VA_ARGS__); \
 		_dispatch_assert_crash(_msg); \
 		free(_msg); \
 	} while (0)
 #else
 #define _dispatch_client_assert_fail(fmt, ...)  do { \
 		char *_msg = NULL; \
-		asprintf(&_msg, "%s" fmt, DISPATCH_ASSERTION_FAILED_MESSAGE, \
+		(void)asprintf(&_msg, "%s" fmt, DISPATCH_ASSERTION_FAILED_MESSAGE, \
 				##__VA_ARGS__); \
 		_dispatch_assert_crash(_msg); \
 		free(_msg); \