Deferred free in C

defer.h

typedef struct free_list_t {
	void (*func)(void *);
	void *arg;
	struct free_list_t *next;
} FreeList;

void _defer(FreeList **f, void (*func)(void *), void *arg) {
	if (arg == NULL) {
		return;
	}

	FreeList *new = calloc(1, sizeof(FreeList));
	new->func = func;
	new->arg = arg;
	new->next = *f;
	*f = new;
}

#define DEFER(F, FUNC, ARG) _defer(&(F), (void (*)(void *))&(FUNC), (void *)ARG);

void defer_free(FreeList *f) {
	while (f != NULL) {
		FreeList *temp = f->next;
		f->func(f->arg);
		free(f);
		f = temp;
	}
}

#define RETURN(f, code) defer_free((f)); return (code);