walk_config_nodes
ret = walk_config_nodes(new_prefix,
(void) walk_config_nodes("", config_root, NULL, dump_node_cb);
int walk_config_nodes(const char *, const nvlist_t *, void *,
err = walk_config_nodes("", nvl, sc, pci_vtscsi_count_targets);
err = walk_config_nodes("", nvl, sc, pci_vtscsi_init_target);
ret = walk_config_nodes("", nvl, &count,