libhb: fix double free in decavcodec during scan
decavcodecvFlush freed the context, then under certain error
conditions, closePriveData freed the context again.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5989 b64f7644-9d1e-0410-96f1-a4d463321fa5
CLI: fix compiler warning


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5990 b64f7644-9d1e-0410-96f1-a4d463321fa5