get value by reference in ranged based loop (commaai#624)

Author: deanlee

drivers/windows/pandaJ2534DLL/PandaJ2534Device.cpp

@@ -150,7 +150,7 @@ DWORD PandaJ2534Device::kline_recv_thread() {
 			continue;
 		}
 
-		for (auto msg : msg_recv) {
+		for (auto &msg : msg_recv) {
 			for (auto& conn : this->connections) {
 				if (conn != nullptr && !conn->isProtoCan()) {
 					J2534Frame msg_out(conn->getProtocol(), msg);

drivers/windows/panda_shared/panda.cpp

@@ -323,7 +323,7 @@ bool Panda::can_send_many(const std::vector<PANDA_CAN_MSG>& can_msgs) {
 	std::vector<PANDA_CAN_MSG_INTERNAL> formatted_msgs;
 	formatted_msgs.reserve(can_msgs.size());
 
-	for (auto msg : can_msgs) {
+	for (auto &msg : can_msgs) {
 		if (msg.bus == PANDA_CAN_UNK) continue;
 		if (msg.len > 8) continue;
 		PANDA_CAN_MSG_INTERNAL tmpmsg = {};