Initialize data

test/fuzz/fuzz_cmp_tool.c

@@ -122,6 +122,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
 
 		argv = FUZZ_malloc(sizeof(*argv) * MAX_ARG_COUNT);
 		data = FUZZ_malloc(sizeof(*data) * MAX_ARG_COUNT * MAX_ARG_SIZE);
+		memset(data, 0, sizeof(*data) * MAX_ARG_COUNT * MAX_ARG_SIZE);
 		for (i = 0; i < MAX_ARG_COUNT; i++)
 			argv[i] = &data[i*MAX_ARG_SIZE];