bcache: Fix register_device_aync typo

Should be `register_device_async`.

Cc: Coly Li <colyli@suse.de>
Signed-off-by: Kai Krakow <kai@kaishome.de>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/bcache/super.c

@@ -2517,7 +2517,7 @@ out:
 	module_put(THIS_MODULE);
 }
 
-static void register_device_aync(struct async_reg_args *args)
+static void register_device_async(struct async_reg_args *args)
 {
 	if (SB_IS_BDEV(args->sb))
 		INIT_DELAYED_WORK(&args->reg_work, register_bdev_worker);
@@ -2611,7 +2611,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 		args->sb	= sb;
 		args->sb_disk	= sb_disk;
 		args->bdev	= bdev;
-		register_device_aync(args);
+		register_device_async(args);
 		/* No wait and returns to user space */
 		goto async_done;
 	}