rbtree_last
node = (struct auth_data*)rbtree_last(&z->data);
node = rbtree_last(&reuse->tree_by_id);
rbnode_type *rbtree_last(rbtree_type *rbtree);
data = (struct val_neg_data*)rbtree_last(&zone->tree);
prev = (struct ixfr_data*)rbtree_last(ixfr->data);
prev = (struct ixfr_data*)rbtree_last(ixfr->data);
if(rbtree_last(zone->nsec3tree)->key == domain) {
rbnode_type *rbtree_last(rbtree_type *rbtree);
node = (struct auth_data*)rbtree_last(&z->data);
node = rbtree_last(&reuse->tree_by_id);
rbnode_type *rbtree_last(rbtree_type *rbtree);
data = (struct val_neg_data*)rbtree_last(&zone->tree);