Untested with "non fuzzed" samples as i have no such file

Fixes: shift exponent 32 is too large for 32-bit type 'int'
Fixes: 
50930/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVPACK_fuzzer-6319201949712384

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/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 7aa1f65e17b..b4d19df7ea2 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -126,7 +126,7 @@ static av_always_inline unsigned get_tail(GetBitContext 
*gb, unsigned k)
     if (k < 1)
         return 0;
     p   = av_log2(k);
-    e   = (1 << (p + 1)) - k - 1;
+    e   = (1LL << (p + 1)) - k - 1;
     res = get_bits_long(gb, p);
     if (res >= e)
         res = (res << 1) - e + get_bits1(gb);
-- 
2.17.1

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