Fixed MIDI device class driver MIDI_Device_ReceiveEventPacket() for the XMEGA architecture.

LUFA/Drivers/USB/Class/Device/MIDIClassDevice.c

@@ -60,7 +60,7 @@ void MIDI_Device_USBTask(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
 
 	#if !defined(NO_CLASS_DRIVER_AUTOFLUSH)
 	Endpoint_SelectEndpoint(MIDIInterfaceInfo->Config.DataINEndpoint.Address);
-	
+
 	if (Endpoint_IsINReady())
 	  MIDI_Device_Flush(MIDIInterfaceInfo);
 	#endif
@@ -113,6 +113,9 @@ bool MIDI_Device_ReceiveEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInter
 
 	Endpoint_SelectEndpoint(MIDIInterfaceInfo->Config.DataOUTEndpoint.Address);
 
+	if (!(Endpoint_IsOUTReceived()))
+		return false;
+
 	if (!(Endpoint_IsReadWriteAllowed()))
 	  return false;