avcodec/decode: Fix integer overflow in max_samples check

Fixes: signed integer overflow: 1677721600 * 32 cannot be represented in type 'int'
Fixes: 18885/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5741242185154560

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

libavcodec/decode.c

@@ -1925,7 +1925,7 @@ static int get_buffer_internal(AVCodecContext *avctx, AVFrame *frame, int flags)
             return AVERROR(EINVAL);
         }
     } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
-        if (frame->nb_samples * avctx->channels > avctx->max_samples) {
+        if (frame->nb_samples * (int64_t)avctx->channels > avctx->max_samples) {
             av_log(avctx, AV_LOG_ERROR, "samples per frame %d, exceeds max_samples %"PRId64"\n", frame->nb_samples, avctx->max_samples);
             return AVERROR(EINVAL);
         }