topo_next_nonchild_node
node = topo_next_nonchild_node(root, node);
node = topo_next_nonchild_node(root, node);
struct topo_node * topo_next_nonchild_node(struct topo_node *top,
node = topo_next_nonchild_node(root, node);
node = topo_next_nonchild_node(root, node);
node = topo_next_nonchild_node(root, node);