swscale/output: Fix integer overflow in yuv2rgba64_full_1_c_template()
Fixes: signed integer overflow: -1082982400 + -1079364728 cannot be represented in type 'int' Fixes: 67910/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-5329011971522560 The input is 9bit in 16bit, the fuzzer fills all 16bit thus generating "invalid" input No overflow should happen with valid input. 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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