kobject: convert debugfs to use kobject_create

We don't need a kset here, a simple kobject will do just fine, so
dynamically create the kobject and use it.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

fs/debugfs/inode.c

@@ -426,20 +426,19 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 }
 EXPORT_SYMBOL_GPL(debugfs_rename);
 
-static decl_subsys(debug, NULL);
+static struct kobject *debug_kobj;
 
 static int __init debugfs_init(void)
 {
 	int retval;
 
-	debug_subsys.kobj.kset = &kernel_subsys;
-	retval = subsystem_register(&debug_subsys);
-	if (retval)
-		return retval;
+	debug_kobj = kobject_create_and_add("debug", &kernel_subsys.kobj);
+	if (!debug_kobj)
+		return -EINVAL;
 
 	retval = register_filesystem(&debug_fs_type);
 	if (retval)
-		subsystem_unregister(&debug_subsys);
+		kobject_unregister(debug_kobj);
 	return retval;
 }
 
@@ -447,7 +446,7 @@ static void __exit debugfs_exit(void)
 {
 	simple_release_fs(&debugfs_mount, &debugfs_mount_count);
 	unregister_filesystem(&debug_fs_type);
-	subsystem_unregister(&debug_subsys);
+	kobject_unregister(debug_kobj);
 }
 
 core_initcall(debugfs_init);