Return the line item created in commerce_discount_add_line_item()

Looks like this is already done?

function commerce_discount_add_line_item(EntityDrupalWrapper $order_wrapper, $discount_name, $discount_amount, $data = array()) {
...
// Save the incoming line item now so we get its ID and add it to the oder's
  // line item reference field value.
  commerce_line_item_save($discount_line_item);
  $order_wrapper->commerce_line_items[] = $discount_line_item;

  return $discount_line_item;
}

Sorry for the patch, that's weird...