Fix proposal for memory leak caused by png decoding in videoFFmpeg.cpp T43033 Author: Ulysse MARTIN (youle) Reviewers: dfelinto, ben2610, moguri, lordloki, panzergame Reviewed By: lordloki, panzergame Subscribers: panzergame, lordloki Projects: #game_engine Differential Revision: https://developer.blender.org/D1396