Fixes: 729/clusterfuzz-testcase-5154831595470848

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index a4ba07fc83..943e46a25c 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -273,7 +273,7 @@ static inline int wv_get_value_integer(WavpackFrameContext 
*s, uint32_t *crc,
     unsigned bit;
 
     if (s->extra_bits) {
-        S <<= s->extra_bits;
+        S *= 1 << s->extra_bits;
 
         if (s->got_extra_bits &&
             get_bits_left(&s->gb_extra_bits) >= s->extra_bits) {
-- 
2.11.0

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