Fixes: left shift of 538976288 by 13 places cannot be represented in type 'int'
Fixes: 
56148/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RKA_fuzzer-6257370708967424

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

diff --git a/libavcodec/rka.c b/libavcodec/rka.c
index 2212e3f930..1e6a48568d 100644
--- a/libavcodec/rka.c
+++ b/libavcodec/rka.c
@@ -207,7 +207,7 @@ static int chctx_init(RKAContext *s, ChContext *c,
     c->bprob[0] = s->bprob[0];
     c->bprob[1] = s->bprob[1];
 
-    c->srate_pad = (sample_rate << 13) / 44100 & 0xFFFFFFFCU;
+    c->srate_pad = ((int64_t)sample_rate << 13) / 44100 & 0xFFFFFFFCU;
     c->pos_idx = 1;
 
     for (int i = 0; i < FF_ARRAY_ELEMS(s->bprob[0]); i++)
-- 
2.17.1

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