fsnotify: remove group_num altogether

The original fsnotify interface has a group-num which was intended to be
able to find a group after it was added.  I no longer think this is a
necessary thing to do and so we remove the group_num.

Signed-off-by: Eric Paris <eparis@redhat.com>

kernel/audit_tree.c

@@ -937,8 +937,7 @@ static int __init audit_tree_init(void)
 {
 	int i;
 
-	audit_tree_group = fsnotify_obtain_group(AUDIT_TREE_GROUP_NUM,
-						 0, &audit_tree_ops);
+	audit_tree_group = fsnotify_obtain_group(0, &audit_tree_ops);
 	if (IS_ERR(audit_tree_group))
 		audit_panic("cannot initialize fsnotify group for rectree watches");