btrfs: go to matching label when cleaning em in btrfs_submit_direct

When btrfs_get_chunk_map fails to allocate a new em the cleanup does not
need to be done so the goto target is out_err, which is consistent with
current coding style.
Signed-off-by: NPeng Hao <flyingpeng@tencent.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -8080,7 +8080,7 @@ static void btrfs_submit_direct(const struct iomap_iter *iter,
 		if (IS_ERR(em)) {
 			status = errno_to_blk_status(PTR_ERR(em));
 			em = NULL;
-			goto out_err_em;
+			goto out_err;
 		}
 		ret = btrfs_get_io_geometry(fs_info, em, btrfs_op(dio_bio),
 					    logical, &geom);