rtrequest_delete
error = rtrequest_delete(&info, prio, ifp, &rt, rdomain);
error = rtrequest_delete(&info, rt->rt_priority, ifp, &rt, tableid);
int rtrequest_delete(struct rt_addrinfo *, u_int8_t, struct ifnet *,
error = rtrequest_delete(info, prio, ifp, &rt, tableid);
error = rtrequest_delete(&info, RTP_ANY, ifp, NULL,