Minor opimization on previous commit

lib/MySQL_HostGroups_Manager.cpp

@@ -2685,10 +2685,12 @@ MySQL_Connection * MySrvConnList::get_random_MyConn(MySQL_Session *sess, bool ff
 	unsigned int i;
 	unsigned int l=conns_length();
 	bool needs_warming = false;
-	unsigned int total_connections = mysrvc->ConnectionsFree->conns_length()+mysrvc->ConnectionsUsed->conns_length();
-	unsigned int expected_warm_connections = mysql_thread___free_connections_pct*mysrvc->max_connections/100;
-	if (mysql_thread___connection_warming && (total_connections < expected_warm_connections)) {
-		needs_warming = true;
+	if (mysql_thread___connection_warming) {
+		unsigned int total_connections = mysrvc->ConnectionsFree->conns_length()+mysrvc->ConnectionsUsed->conns_length();
+		unsigned int expected_warm_connections = mysql_thread___free_connections_pct*mysrvc->max_connections/100;
+		if (total_connections < expected_warm_connections) {
+			needs_warming = true;
+		}
 	}
 	if (l && ff==false && needs_warming==false) {
 		if (l>32768) {