rn_delete
rnh->rnh_deladdr = rn_delete;
*rn_delete(void *, void *, struct radix_node_head *),
rn = rn_delete(&ke->pfrke_sa, &mask, head);
rn = rn_delete(&ke->pfrke_sa, NULL, head);
rnh->rnh_deladdr = rn_delete;
*rn_delete(const void *, const void *, struct radix_node_head *),
rn = rn_delete(v_arg, netmask_arg, head);