I cannot use user2userpoints to transfer points

I tried to modify user2userpoints.module and I can transfer points now.

line 63
old:

//return $form;

new:

return user2userpoints_submit($form);

line 91-100
old:

function user2userpoints_submit($form_id, $form_values) {
  global $user;

  $points = $form_values['amount'];
  $to = user_load(array('name' => $form_values['to']));

  userpoints_userpointsapi('points', $points, $to->uid, 'From: ' . $user->name);
  userpoints_userpointsapi('points', -$points, $user->uid, 'To: ' . $to->name);
}

new:

function user2userpoints_submit($form_values) {
  global $user;
  $points = (int)$form_values['amount'];
  $to = user_load(array('uid' => $form_values['to']));

  userpoints_userpointsapi('points', $points, $to->uid, 'From: ', $user->name);
  userpoints_userpointsapi('points', $points * -1, $user->uid, 'To: ' . $to->name);
}

Thanks, please use erwinova's patch, my patch still have problems.