Fix audit commenting where there are only inlines
Summary: been some changes here and this code was broked. turns out we re-assign $action like two lines later and never used the initial value, so we can simply delete the offending line. Fixes T5745.
Test Plan: submitted inline comment pre-patch and fatal. re-submitted post patch and great success!
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Maniphest Tasks: T5745
Differential Revision: https://secure.phabricator.com/D10078