}
// Return the number of times that an element is equal to (i+value)%256 between buf[start] and buf[stop-1].
-static int count_all(const uint8_t* buf, size_t start, size_t stop, uint8_t value)
+static size_t count_all(const uint8_t* buf, size_t start, size_t stop, uint8_t value)
{
size_t occ = 0;
for(size_t i = start ; i < stop ; i++) {