rem: if (anchor == NULL) {
add: if (!anchor) {
context: int insert_RR(struct sip_msg* _m, str* _l){	struct lump* anchor;	anchor = anchor_lump(&_m->add_rm, _m->headers->name.s - _m->buf, 0 , 0);	if (anchor == NULL) {		LOG(L_ERR, "insert_RR(): Can't get anchor\n");		return -1;	}		if (insert_new_lump_before(anchor, _l->s, _l->len, 0) == 0) {				LOG(L_ERR, "insert_RR(): Can't insert Record-Route\n");		return -2;	}	return 0;}