ns_tree_node_del
void ns_tree_node_del(struct ns_tree_node *node, struct ns_tree_root *root);
ns_tree_node_del(&ns->ns_tree_node, ns_tree);
ns_tree_node_del(&ns->ns_unified_node, &ns_unified_root);
ns_tree_node_del(&ns->ns_owner_node, &owner->ns_owner_root);