_uc_linkpoint_api_void_order() uses watchdog() with an undefined $error variable

In this code:

  $retarr = _uc_linkpoint_api_execute_txn($xml);
  if ($retarr['r_approved'] == 'APPROVED') {
    return TRUE;
  }
  else {
    watchdog('uc_linkpoint_api', 'Unable to void transaction: !error', array('!error' => $error), WATCHDOG_ERROR);
    return FALSE;
  }

At least in version 1.5, $error isn't initialized anywhere. I'm guessing that should be referring to some part of the $retarr array instead. When you fix this, unless you're using secure messages explicitly defined by your module, you should also switch to the @ replacement type. Ya never know if the gateway might include some unescaped characters.