PHP warning in Task Console from maestro_common.module

I get the following warning when rendering the Task Console:

Strict warning: Only variables should be passed by reference in maestro_show_message() (line 44 of /var/www/htdocs/sites/all/modules/maestro/modules/maestro_common/maestro_common.module).

It only occurs when there is a task listed in the console.

Line 44 reads:

$retval->html = drupal_render(drupal_get_form('maestro_show_message_form',array('message' => $parms['message'])));

I could find only one Maestro issue that included drupal_get_form, and it did not seem to pertain.

I can find examples of this warning in other module issue queus, and some example fixes, but I figured I would open this ticket. I am guessing I could disable strict, but I don't like to start there lest I become dumber :)