gst-ffmpeg: fix for Security Advisory CVE-2013-0865

gst-ffmpeg: fix for Security Advisory CVE-2013-0865

The vqa_decode_chunk function in libavcodec/vqavideo.c in FFmpeg before
1.0.4 and 1.1.x before 1.1.2 allows remote attackers to have an
unspecified impact via a large (1) cbp0 or (2) cbpz chunk in Westwood
Studios VQA Video file, which triggers an out-of-bounds write.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0865

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>