avcodec/vp7: Fix null pointer dereference in vp7_decode_frame_header()
This simply copies the "interframe without a prior keyframe" check thats done later into vp7_decode_frame_header() Found-by: NVittorio Giovara <vittorio.giovara@gmail.com> Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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