$s_watching_img passed to watch_topic_forum() and not used

An array is passed to the function watch_topic_forum() as $s_watching_img and is not used in the function. The function is called from both viewtopic.php and viewforum.php This array is passed by reference. The refering arrays, $s_watching_topic_img and $s_watching_forum_img are defined and not used as well, besides being passed to the function.