Better fix for reset_deadline
Better fix for reset_deadline

Follow-up to 876af8f27c0759fe9003332f0a20e1ec8e26ab1e.
The issue was caused because we called end_get_diff to cleanup a diff
that could not actually be started.

This also enables further cleanup later on.

LonamiWebs/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon