rem: CHECK(*handle);
context: iptc_flush_entries(const ipt_chainlabel chain, iptc_handle_t *handle){	unsigned int startindex, endindex;	struct chain_cache *c;	int ret;	CHECK(*handle);	iptc_fn = iptc_flush_entries;	if (!(c = find_label(chain, *handle))) {		errno = ENOENT;		return 0;	}	startindex = entry2index(*handle, c->start);	endindex = entry2index(*handle, c->end);	ret = delete_rules(endindex - startindex,			   (char *)c->end - (char *)c->start,			   entry2offset(*handle, c->start), startindex,			   handle);	CHECK(*handle);	return ret;}