ext4: fix possible double unlock when moving a directory

Fixes: 0813299c586b ("ext4: Fix possible corruption when moving a directory")
Link: https://lore.kernel.org/r/[e-mail]
Reported-by: Dan Carpenter <[e-mail]>
Reported-by: [e-mail]
Signed-off-by: Theodore Ts'o <[e-mail]>

fs/ext4/namei.c

···
 				goto end_rename;
 		}
 		retval = ext4_rename_dir_prepare(handle, &old);
-		if (retval) {
-			inode_unlock(old.inode);
+		if (retval)
 			goto end_rename;
-		}
 	}
 	/*
 	 * If we're renaming a file within an inline_data dir and adding or