rn_delete
*rn_delete(void *, void *, struct radix_node_head *),
rnh->rnh_deladdr = rn_delete;
rnh->rnh_deladdr = rn_delete;
*rn_delete(void *, void *, struct radix_node_head *);
*rn_delete __P((void *, void *, struct radix_node_head *)),