btrfs: unlock on error in btrfs_file_llseek()

There were some unlocks on error missing in a recent patch to
btrfs_file_llseek().

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 658d669..f7d9df7 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1804,10 +1804,14 @@
 		}
 	}
 
-	if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
-		return -EINVAL;
-	if (offset > inode->i_sb->s_maxbytes)
-		return -EINVAL;
+	if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) {
+		ret = -EINVAL;
+		goto out;
+	}
+	if (offset > inode->i_sb->s_maxbytes) {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	/* Special lock needed here? */
 	if (offset != file->f_pos) {