Unset NDEBUG so assert() is enabled in all tests. One more fix there when building with -DCMAKE_BUILD_TYPE=release.

tests/test_parse.c

@@ -1,3 +1,6 @@
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
 #include <assert.h>
 #include <stddef.h>
 #include <stdio.h>
@@ -42,6 +45,7 @@ static void single_incremental_parse(const char *test_string, int clear_serializ
 	json_object *all_at_once_obj, *new_obj;
 	const char *all_at_once_str, *new_str;
 
+	new_obj = NULL;
 	assert(chunksize > 0);
 	all_at_once_obj = json_tokener_parse(test_string);
 	if (clear_serializer)