Fix a trivial bug with fixed point average calculation introduced by careless copying a few commits below

common.cpp

@@ -251,5 +251,5 @@ float average(const Caches& cc, float Cache::*ptr) {
 }
 
 float average(const Caches& cc, int Cache::*ptr) {
-	return std::accumulate(cc.begin(), cc.end(), 0, [&](const float& a, const Cache& b) { return std::move(a) + b.*ptr; }) / cc.size();
+	return 1.0 * std::accumulate(cc.begin(), cc.end(), 0, [&](const float& a, const Cache& b) { return std::move(a) + b.*ptr; }) / cc.size();
 }