ext4: fix error code in ext4_commit_super

We should set the error code when ext4_commit_super check argument failed.
Found in code review.
Fixes: c4be0c1 ("filesystem freeze: add error handling of write_super_lockfs/unlockfs").

Cc: [email protected]
Signed-off-by: Fengnan Chang <[email protected]>
Reviewed-by: Andreas Dilger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>

Author: Fengnan Chang

fs/ext4/super.c

@@ -5585,8 +5585,10 @@ static int ext4_commit_super(struct super_block *sb)
 	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
 	int error = 0;
 
-	if (!sbh || block_device_ejected(sb))
-		return error;
+	if (!sbh)
+		return -EINVAL;
+	if (block_device_ejected(sb))
+		return -ENODEV;
 
 	ext4_update_super(sb);