libobs: Fix potential filter rendering race condition

Browse Source

The filters array should not be accessed without locking the filter
mutex.  This locks the filter mutex, grabs a reference to the first
filter, unlocks the mutex, renders the filter, and then releases the
reference.

Closes obsproject/obs-studio#1215

...

This commit is contained in:

500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f