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Fix ubsan warning: vp8/encoder/denoising.c

BUG=webm:1219

Change-Id: Iebdedfb27c70909c0849e169473a2a3ec9f58cc7

--- a/vp8/encoder/denoising.c

+++ b/vp8/encoder/denoising.c

@@ -529,7 +529,7 @@

         // Bias on zero motion vector sse.

         const int zero_bias = denoiser->denoise_pars.denoise_mv_bias;

         zero_mv_sse = (unsigned int)((int64_t)zero_mv_sse * zero_bias / 100);

-        sse_diff = zero_mv_sse - best_sse;

+        sse_diff = (int)zero_mv_sse - (int)best_sse;

         saved_mbmi = *mbmi;