btrfs: return real error from read_alloc_one_name() in drop_one_dir_item()

If read_alloc_one_name() we explicitly return -ENOMEM and currently that
is fine since it's the only error read_alloc_one_name() can return for
now. However this is fragile and not future proof, so return instead what
read_alloc_one_name() returned.

Reviewed-by: Boris Burkov <[email protected]>
Reviewed-by: Qu Wenruo <[email protected]>
Signed-off-by: Filipe Manana <[email protected]>

Author: fdmanana

fs/btrfs/tree-log.c

@@ -950,7 +950,7 @@ static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans,
 	btrfs_dir_item_key_to_cpu(leaf, di, &location);
 	ret = read_alloc_one_name(leaf, di + 1, btrfs_dir_name_len(leaf, di), &name);
 	if (ret)
-		return -ENOMEM;
+		return ret;
 
 	btrfs_release_path(path);