mtd: ubi: Restore missing cleanup on ubi_init() failure path

We need to clean-up debugfs and ubiblock if we fail after initialising
them.
Signed-off-by: Ben Hutchings <ben.hutchings@mind.be>
Fixes: 927c1452 ("mtd: ubi: attach from device tree")
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/ubi/build.c

@@ -1372,7 +1372,7 @@ static int __init ubi_init(void)
 
 		/* See comment above re-ubi_is_module(). */
 		if (ubi_is_module())
-			goto out_slab;
+			goto out_debugfs;
 	}
 
 	register_mtd_user(&ubi_mtd_notifier);
@@ -1387,6 +1387,9 @@ static int __init ubi_init(void)
 
 out_mtd_notifier:
 	unregister_mtd_user(&ubi_mtd_notifier);
+	ubiblock_exit();
+out_debugfs:
+	ubi_debugfs_exit();
 out_slab:
 	kmem_cache_destroy(ubi_wl_entry_slab);
 out_dev_unreg: