This patch fixes: - the call of LibFree on a unfinished loaded library; - memory leak created on end of game : the async libraries are loaded but not converted, so not freed with the master scene. Reviewers: campbellbarton, sybren, youle, hg1, moguri, lordloki Reviewed By: moguri, lordloki Differential Revision: https://developer.blender.org/D1571