Change CSipHasher's count variable to uint8_t

src/crypto/siphash.cpp

@@ -49,7 +49,7 @@ CSipHasher& CSipHasher::Write(const unsigned char* data, size_t size)
 {
     uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
     uint64_t t = tmp;
-    int c = count;
+    uint8_t c = count;
 
     while (size--) {
         t |= ((uint64_t)(*(data++))) << (8 * (c % 8));