avcodec/pixlet: Fixes: runtime error: signed integer overflow: 9203954323419769657 + 29897660706736950 cannot be represented in type 'long'

Fixes: 1569/clusterfuzz-testcase-minimized-6328690508038144

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/pixlet.c

@@ -256,7 +256,7 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, i
             j = 0;
             dst += stride;
         }
-        state += (int64_t)d * yflag - ((int64_t)(d * (uint64_t)state) >> 8);
+        state += (int64_t)d * (uint64_t)yflag - ((int64_t)(d * (uint64_t)state) >> 8);
 
         flag = 0;