Notice: Undefined variable: dat in _simplenews_measure_usec()

There is a notice in the following code in simplenews.module:

function _simplenews_measure_usec($start = FALSE) {
  // Windows systems don't implement getrusage(). There is no alternative.
  if (!function_exists('getrusage')) {
    return 0;
  }
  
  static $start_time;
  $usage = getrusage();
  $now = (float)($dat["ru_stime.tv_sec"] .'.'. $dat["ru_stime.tv_usec"]) + (float)($usage["ru_utime.tv_sec"] .'.'. $usage["ru_utime.tv_usec"]);

  if ($start) {
    $start_time = $now;
    return 0;
  }
  return $now - $start_time;
}

When I look at the same code in the 6.x-2.x branch, it should be

function _simplenews_measure_usec($start = FALSE) {
  // Windows systems don't implement getrusage(). There is no alternative.
  if (!function_exists('getrusage')) {
    return 0;
  }
  
  static $start_time;
  $usage = getrusage();
  $now = (float)($usage["ru_utime.tv_sec"] .'.'. $usage["ru_utime.tv_usec"]);

  if ($start) {
    $start_time = $now;
    return 0;
  }
  return $now - $start_time;
}

Is it possible to have this fixed for 6.x-1.x too? I also noticed there is a 6.x-1.4 tag but no release.