const int prods[4] = { 0x090000, 0x000900, 0x040102, 0x010402 };
/* Check if all pixels have the same index */
- if (mask ^ (mask << 2) < 4) {
+ if ((mask ^ (mask << 2)) < 4) {
/* If so, linear system would be singular; solve using optimal
* single-color match on average color. */
int r = 8, g = 8, b = 8;