Changed manual map clearing with a built-in clear method in lrucache

lrucache/lru.go

@@ -58,9 +58,7 @@ func (c *lrucache) Range(f func(key, value int) bool) {
 }
 
 func (c *lrucache) Clear() {
-	for k := range c.data {
-		delete(c.data, k)
-	}
+	clear(c.data)
 	c.recentEntries.Init()
 }