fix warning from static analysis.
"-1 cannot be represented in type 'unsigned int'"
@@ -1576,7 +1576,7 @@ static int ComputeCacheEntropies(const uint32_t* argb,
// Update the histograms for distance/length.
int len = PixOrCopyLength(v);
int code_dist, code_len, extra_bits;
- uint32_t argb_prev = *argb - 1;
+ uint32_t argb_prev = *argb ^ 0xffffffffu;
VP8LPrefixEncodeBits(len, &code_len, &extra_bits);
VP8LPrefixEncodeBits(PixOrCopyDistance(v), &code_dist, &extra_bits);
for (i = 1; i <= cache_bits_max; ++i) {
