get rid of av_rescale_q, it does not work as intended.

Originally committed as revision 9939 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/xsubdec.c

@@ -20,7 +20,6 @@ static uint64_t parse_timecode(AVCodecContext *avctx, uint8_t *buf) {
         if (c > 9) return AV_NOPTS_VALUE;
         ms = (ms + c) * tc_muls[i];
     }
-    ms = av_rescale_q(ms, (AVRational){1, 1000}, avctx->time_base);
     return ms;
 }