Account the nr_entries in rblist properly

The nr_entries in rblist is never decremented when an element
is deleted. Also, use rblist__remove_node to delete a node in
rblist__delete(). This would keep the nr_entries sane.
Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Acked-by: David S. Ahern <dsahern@gmail.com>
Cc: David S. Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/20120831070834.14806.87398.stgit@suzukikp.in.ibm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/rblist.c

@@ -44,6 +44,7 @@ int rblist__add_node(struct rblist *rblist, const void *new_entry)
 void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
 {
 	rb_erase(rb_node, &rblist->entries);
+	--rblist->nr_entries;
 	rblist->node_delete(rblist, rb_node);
 }
 
@@ -87,8 +88,7 @@ void rblist__delete(struct rblist *rblist)
 		while (next) {
 			pos = next;
 			next = rb_next(pos);
-			rb_erase(pos, &rblist->entries);
-			rblist->node_delete(rblist, pos);
+			rblist__remove_node(rblist, pos);
 		}
 		free(rblist);
 	}