avformat/rmdec: use 64bit for audio_framesize checks

It is not entirely clear what would prevent such overflow so even if it is
not possible, it is better to use 64bit

Fixes: CID1491898 Unintentional integer overflow

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 665be4fa2f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/rmdec.c

@@ -267,9 +267,9 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
         case DEINT_ID_INT4:
             if (ast->coded_framesize > ast->audio_framesize ||
                 sub_packet_h <= 1 ||
-                ast->coded_framesize * (uint64_t)sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
+                ast->coded_framesize * (uint64_t)sub_packet_h > (2LL + (sub_packet_h & 1)) * ast->audio_framesize)
                 return AVERROR_INVALIDDATA;
-            if (ast->coded_framesize * (uint64_t)sub_packet_h != 2*ast->audio_framesize) {
+            if (ast->coded_framesize * (uint64_t)sub_packet_h != 2LL*ast->audio_framesize) {
                 avpriv_request_sample(s, "mismatching interleaver parameters");
                 return AVERROR_INVALIDDATA;
             }