Fixes: runtime error: signed integer overflow: 2147483520 + 128 cannot be 
represented in type 'int'
Fixes: 4800/clusterfuzz-testcase-minimized-6110372403609600

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/ac3dec_fixed.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/ac3dec_fixed.c b/libavcodec/ac3dec_fixed.c
index 9a6d7a08b1..bd66175d50 100644
--- a/libavcodec/ac3dec_fixed.c
+++ b/libavcodec/ac3dec_fixed.c
@@ -64,8 +64,8 @@ static void scale_coefs (
     int dynrng,
     int len)
 {
-    int i, shift, round;
-    unsigned mul;
+    int i, shift;
+    unsigned mul, round;
     int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
 
     mul = (dynrng & 0x1f) + 0x20;
-- 
2.15.1

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