codecparsers: h264: fix memory leak in GstH264PPS.
The gst_h264_parse_pps() function dynamically allocates the slice group ids map array, so that needs to be cleared before parsing a new PPS NAL unit again, or when it is no longer needed. Likewise, a clean copy to the internal NAL parser state needs to be performed so that to avoid a double-free corruption. https://bugzilla.gnome.org/show_bug.cgi?id=707282Signed-off-by: Gwenole Beauchesne <firstname.lastname@example.org>
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