* NULL's out the hwloc_obj_t->userdata in
hwloc_base_util.c:free_object() and
hwloc_base_util.c:opal_hwloc_base_free_topology() after it has been
OBJ_RELEASE'd.
* Adds a userdata field to opal_hwloc_topo_data_t. This field will
be used in an upcoming rmaps component ("lama") to cache some
associated data during hardware tree traversals.
This commit was SVN r26938.