While adding custom submit handler to commerce_auction_place_bid_form ?

function commerce_auction_place_bid_form_submit($form, &$form_state) {
  $node = $form_state['#node'];
  $timeout_field = field_get_items('node', $node, 'auction_timeout');
  if (!isset($timeout_field) || empty($timeout_field) || !$timeout_field[0]['value']) {
    drupal_set_message(t('Auction timeout has no value, Please first set a value for the timeout field.'), 'error');
  }
  field_attach_submit('commerce_auction_bid', $form_state['#entity'], $form, $form_state);
  global $user;

  // Save entity (new commerce_auction_bid entity that contains the bid amount
  // entered in the form.)
  $entity = $form_state['#entity'];
  $entity->uid = $user->uid;
  $entity->created = REQUEST_TIME;
  $amount = commerce_currency_amount_to_decimal($entity->bid_amount[LANGUAGE_NONE][0]['amount'], commerce_default_currency());
  $entity->title = $user->name . ' (' . $amount . ')';
  $entity->save();

  // Update node, so that it references this bid too,
  $delta = (empty($node->auction_bid_refs[LANGUAGE_NONE])) ? 0 : max(array_keys($node->auction_bid_refs[LANGUAGE_NONE])) + 1;
  $node->auction_bid_refs[LANGUAGE_NONE][$delta]['target_id'] = $entity->id;

  // Update highest bid on display node.
  // This makes creating per-user bidding tables easier.
  $node->auction_highest_bid[LANGUAGE_NONE][0] = $entity->bid_amount[LANGUAGE_NONE][0];

  // If we are in the last 15 minutes of the auction timeout,
  // Extend timeout for 30minutes
  $expiration_timestamp = $timeout_field[0]['value'];
  $time_period = variable_get('commerce_auction_final_period', 15) * 60;
  $extension_time = variable_get('commerce_auction_extension_time', 30) * 60;
  $extend_timeout = variable_get('commerce_auction_extend', TRUE);
  if ($extend_timeout &&
      $expiration_timestamp - REQUEST_TIME < $time_period &&
      $expiration_timestamp - REQUEST_TIME > 0) {
    $timeout_field[0]['value'] = $extension_time + $expiration_timestamp;
  }
  $node->auction_timeout[LANGUAGE_NONE][0]['value'] = $timeout_field[0]['value'];

  // Now that everything is updated, save the node!
  node_save($node);

  drupal_set_message(t('Your bid is saved!'));
  drupal_goto('node/' . $node->nid);
}

Due to usage of drupal_goto() above , when I add a custom submit handler using hook_form_alter , it does not execute code inside the custom submit handler, I would suggest adding $form_state['redirect'] = 'node/'. $node->nid;

I would like to add a patch for the same.

would request someone to help me on how to add a patch?