decoder crash when JVET_AC0196_NNSR is ON
JVET_AC0196_NNSR remove destroyTempBuffers in finishPicture but the corresponding destroyTempBuffers in xFlushOutput is not called when no NNSR is activated. It causes the Picture reuse (in xGetNewPicBuffer) to reuse a Picture with already created buffer (which throw in Buffer.cpp).