rem: CHECK(*handle);
context: iptc_append_entry(const ipt_chainlabel chain,		  const struct ipt_entry *e,		  iptc_handle_t *handle){	struct chain_cache *c;	struct ipt_entry_target old;	int ret;	CHECK(*handle);	iptc_fn = iptc_append_entry;	if (!(c = find_label(chain, *handle))) {		errno = ENOENT;		return 0;	}	if (!map_target(*handle, (struct ipt_entry *)e,			entry2offset(*handle, c->end), &old))		return 0;	ret = insert_rules(1, e->next_offset, e,			   entry2offset(*handle, c->end),			   entry2index(*handle, c->end),			   0, handle);	unmap_target((struct ipt_entry *)e, &old);	CHECK(*handle);	return ret;}