Code review comment for lp:~percona-core/percona-xtradb-cluster/bug-1402166

Shouldn't the code be rewritten as follows:

    if (!tmp || proc.error())
    {
      WSREP_ERROR("Failed to read uuid:seqno from joiner script.");
      if (proc.error())
        err = proc.error();
    }
    else
    {
      err= sst_scan_uuid_seqno (out, &ret_uuid, &ret_seqno);
    }