Fix mem leak in core/test/run-time-utils

Fixes the following LeakSanitizer errors:

=================================================================
==32426==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 56 byte(s) in 1 object(s) allocated from:
    #0 0x7fd94a1fa850 in malloc (/lib64/libasan.so.4+0xde850)
    #1 0x4014d4 in main core/test/run-time-utils.c:30
    #2 0x7fd94904c509 in __libc_start_main (/lib64/libc.so.6+0x20509)

Direct leak of 8 byte(s) in 1 object(s) allocated from:
    #0 0x7fd94a1fa850 in malloc (/lib64/libasan.so.4+0xde850)
    #1 0x4014f0 in main core/test/run-time-utils.c:32
    #2 0x7fd94904c509 in __libc_start_main (/lib64/libc.so.6+0x20509)

Direct leak of 4 byte(s) in 1 object(s) allocated from:
    #0 0x7fd94a1fa850 in malloc (/lib64/libasan.so.4+0xde850)
    #1 0x4014e2 in main core/test/run-time-utils.c:31
    #2 0x7fd94904c509 in __libc_start_main (/lib64/libc.so.6+0x20509)

Signed-off-by: Stewart Smith <[email protected]>

Author: stewartsmith

core/test/run-time-utils.c

@@ -55,6 +55,9 @@ int main(void)
 	assert(t->tm_min == 42);
 	assert(t->tm_sec == 24);
 
+	free(t);
+	free(ymd);
+	free(hms);
 	return 0;
 }