Make sure rtjpeg quality is a valid value

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@10444 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/nuv.c

@@ -97,6 +97,7 @@ static int get_quant(AVCodecContext *avctx, NuvContext *c,
  */
 static void get_quant_quality(NuvContext *c, int quality) {
     int i;
+    quality = FFMAX(quality, 1);
     for (i = 0; i < 64; i++) {
         c->lq[i] = (fallback_lquant[i] << 7) / quality;
         c->cq[i] = (fallback_cquant[i] << 7) / quality;