btrfs: handle record_root_in_trans failure in btrfs_record_root_in_trans

record_root_in_trans can fail currently, handle this failure properly.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>