btrfs: return the actual error value from from btrfs_uuid_tree_iterate

In function btrfs_uuid_tree_iterate(), errno is assigned to variable ret
on errors. However, it directly returns 0. It may be better to return
ret. This patch also removes the warning, because the caller already
prints a warning.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188731
Signed-off-by: Pan Bian <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
[ edited subject ]
Signed-off-by: David Sterba <[email protected]>

fs/btrfs/uuid-tree.c

@@ -352,7 +352,5 @@ int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
 
 out:
 	btrfs_free_path(path);
-	if (ret)
-		btrfs_warn(fs_info, "btrfs_uuid_tree_iterate failed %d", ret);
-	return 0;
+	return ret;
 }