LOCAL: disk-lights work 2

*** 135,144 ****
--- 135,146 ----
      nvlist_t *, nvlist_t **, int *);
  extern boolean_t topo_method_supported(tnode_t *, const char *,
      topo_version_t);
  extern int topo_node_facility(topo_hdl_t *, tnode_t *, const char *,
      uint32_t, topo_faclist_t *, int *);
+ extern int topo_node_child_walk(topo_hdl_t *, tnode_t *, topo_walk_cb_t,
+     void *, int *);
  
  /*
   * Node flags: denotes type of node
   */
  #define TOPO_NODE_DEFAULT       0