avcodec/utils: fix 2 integer overflows in get_audio_frame_duration()

Fixes: signed integer overflow: 256 * 668003712 cannot be represented in type 'int'
Fixes: 59819/clusterfuzz-testcase-minimized-ffmpeg_dem_MATROSKA_fuzzer-4674636538052608

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a4bf559683)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/utils.c

@@ -641,9 +641,9 @@ static int get_audio_frame_duration(enum AVCodecID id, int sr, int ch, int ba,
     if (sr > 0) {
         /* calc from sample rate */
         if (id == AV_CODEC_ID_TTA)
-            return 256 * sr / 245;
+            return 256ll * sr / 245;
         else if (id == AV_CODEC_ID_DST)
-            return 588 * sr / 44100;
+            return 588ll * sr / 44100;
         else if (id == AV_CODEC_ID_BINKAUDIO_DCT) {
             if (sr / 22050 > 22)
                 return 0;