avformat/vividas: Check number of audio channels

Fixes: division by 0
Fixes: 28597/clusterfuzz-testcase-minimized-ffmpeg_dem_VIVIDAS_fuzzer-5752201490333696

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

libavformat/vividas.c

@@ -373,7 +373,7 @@ static int track_header(VividasDemuxContext *viv, AVFormatContext *s,  uint8_t *
         avio_rl16(pb); //codec_subid
         st->codecpar->channels = avio_rl16(pb); // channels
         st->codecpar->sample_rate = avio_rl32(pb); // sample_rate
-        if (st->codecpar->sample_rate <= 0)
+        if (st->codecpar->sample_rate <= 0 || st->codecpar->channels <= 0)
             return AVERROR_INVALIDDATA;
         avio_seek(pb, 10, SEEK_CUR); // data_1
         q = avio_r8(pb);