btrfs_get_extent() sets variable ret, but out: error path expect error
to be in variable err. Fix that.

Signed-off-by: Pavel Machek (CIP) <pavel@denx.de>

---

Notice that patch introducing this problem is on its way to 4.19.137-stable.

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7befb7c12bd3..4aaa01540f89 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7012,7 +7012,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 	    found_type == BTRFS_FILE_EXTENT_PREALLOC) {
 		/* Only regular file could have regular/prealloc extent */
 		if (!S_ISREG(inode->vfs_inode.i_mode)) {
-			ret = -EUCLEAN;
+			err = -EUCLEAN;
 			btrfs_crit(fs_info,
 		"regular/prealloc extent found for non-regular inode %llu",
 				   btrfs_ino(inode));

-- 
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