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svq3: protect against negative quantizers.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC: libav-stable@libav.org
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@ -650,7 +650,7 @@ static int svq3_decode_mb(SVQ3Context *svq3, unsigned int mb_type)
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if (IS_INTRA16x16(mb_type) || (s->pict_type != AV_PICTURE_TYPE_I && s->adaptive_quant && cbp)) {
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s->qscale += svq3_get_se_golomb(&s->gb);
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if (s->qscale > 31){
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if (s->qscale > 31u){
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av_log(h->s.avctx, AV_LOG_ERROR, "qscale:%d\n", s->qscale);
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return -1;
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}
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