bcache: Trivial error handling fix

Signed-off-by: Kent Overstreet <kmo@daterainc.com>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index e363efc..677a604 100644 (file)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2065,7 +2065,8 @@ static void bcache_exit(void)
                kobject_put(bcache_kobj);
        if (bcache_wq)
                destroy_workqueue(bcache_wq);
-       unregister_blkdev(bcache_major, "bcache");
+       if (bcache_major)
+               unregister_blkdev(bcache_major, "bcache");
        unregister_reboot_notifier(&reboot);
 }