Fixes: signed integer overflow: 1077952576 * 4 cannot be represented in type 
'int'
Fixes: 
26152/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5674758518341632

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

diff --git a/libavformat/kvag.c b/libavformat/kvag.c
index 0a11fc0556..8f641873b9 100644
--- a/libavformat/kvag.c
+++ b/libavformat/kvag.c
@@ -83,7 +83,7 @@ static int kvag_read_header(AVFormatContext *s)
     par->bits_per_raw_sample    = 16;
     par->block_align            = 1;
     par->bit_rate               = par->channels *
-                                  par->sample_rate *
+                                  (uint64_t)par->sample_rate *
                                   par->bits_per_coded_sample;
 
     avpriv_set_pts_info(st, 64, 1, par->sample_rate);
-- 
2.17.1

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