chromecast: pass the destination namespace by reference

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/stream_out/chromecast/chromecast.h

@@ -70,7 +70,7 @@ struct intf_sys_t
     void msgReceiverClose(std::string destinationId);
     void msgPing();
     void msgPong();
-    void msgConnect(std::string destinationId);
+    void msgConnect(const std::string & destinationId = DEFAULT_CHOMECAST_RECEIVER);
 
     void msgReceiverLaunchApp();
     void msgReceiverGetStatus();

modules/stream_out/chromecast/chromecast_ctrl.cpp

@@ -115,8 +115,7 @@ void intf_sys_t::msgPong()
     messagesToSend.push(msg);
 }
 
-
-void intf_sys_t::msgConnect(std::string destinationId)
+void intf_sys_t::msgConnect(const std::string & destinationId)
 {
     std::string s("{\"type\":\"CONNECT\"}");
     castchannel::CastMessage msg = buildMessage(NAMESPACE_CONNECTION,