Don't pass drupal_get_form() into render()

PHP limits argument passing by reference to variables. Using render(drupal_get_form(...)) results in a warning:

Strict warning: Only variables should be passed by reference in hotel_booking_view() (Line 386 of uc_hotel/hotel_booking/hotel_booking.room_type.inc).

Because http://api.drupal.org/api/drupal/includes--common.inc/function/render/7 declares it's argument to be passed by reference and a plain call to drupal_get_form() is not strictly a variable (which could be modified).

TL;DR:

-  ... render(drupal_get_form(...));
+    $form = drupal_get_form(...);
+    render($form);