Fixes: signed integer overflow: 3 * -2147483648 cannot be represented in type 
'int'
Fixes: 
50993/clusterfuzz-testcase-minimized-ffmpeg_dem_AIFF_fuzzer-6668935979728896

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/aiffdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index 318e3ad742e..80733e58010 100644
--- a/libavformat/aiffdec.c
+++ b/libavformat/aiffdec.c
@@ -428,7 +428,7 @@ static int aiff_read_packet(AVFormatContext *s,
         pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
     /* Only one stream in an AIFF file */
     pkt->stream_index = 0;
-    pkt->duration     = (res / st->codecpar->block_align) * 
aiff->block_duration;
+    pkt->duration     = (res / st->codecpar->block_align) * (int64_t) 
aiff->block_duration;
     return 0;
 }
 
-- 
2.17.1

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