[Modify] Polish it

websocket-sharp/Ext.cs

@@ -1897,7 +1897,12 @@ namespace WebSocketSharp
     /// </param>
     public static void Times (this long n, Action<long> action)
     {
-      if (n > 0 && action != null)
+      if (n <= 0)
+        return;
+
+      if (action == null)
+        return;
+
       for (long i = 0; i < n; i++)
         action (i);
     }