Strict warning when visting login page.

Got the following error when visiting the login page.
Strict warning: Only variables should be passed by reference in luxe_login_page() (line 52 of \sites\all\modules\luxe\luxe.module).
To fix, change line 52 from

  $login_form = drupal_render(drupal_get_form('user_login'));

to

  $login_form = drupal_get_form('user_login');
  $login_form = drupal_render($login_form);