rn_insert
x = rn_insert(cp, mask_rnhead, &maskduplicated, x);
saved_tt = tt = rn_insert(v, head, &keyduplicated, treenodes);
x = rn_insert(cp, &maskhead->head, &maskduplicated, x);
*rn_insert(void *, struct radix_head *, int *,
saved_tt = tt = rn_insert(v, head, &keyduplicated, treenodes);