avcodec/ffwavesynth: Fix undefined overflow in wavesynth_synth_sample()
Fixes: signed integer overflow: 2147464192 + 21176 cannot be represented in type 'int' Fixes: 19042/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5719828090585088 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by:Michael Niedermayer <michael@niedermayer.cc>
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