Minor cleanups to DualCDC ClassDriver device demo for clarity.

Demos/Device/ClassDriver/CDC/CDC.c

@@ -92,6 +92,7 @@ int main(void)
 	{
 		CheckJoystickMovement();
 		
+		/* Must throw away unused bytes from the host, or it will lock up while waiting for the device */
 		while (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface))
 		  CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
 

Demos/Device/ClassDriver/DualCDC/DualCDC.c

@@ -99,13 +99,11 @@ int main(void)
 		CheckJoystickMovement();
 
 		/* Discard all received data on the first CDC interface */
-		uint16_t BytesToDiscard = CDC_Device_BytesReceived(&VirtualSerial1_CDC_Interface);
-		while (BytesToDiscard--)
+		while (CDC_Device_BytesReceived(&VirtualSerial1_CDC_Interface))
 		  CDC_Device_ReceiveByte(&VirtualSerial1_CDC_Interface);
 
 		/* Echo all received data on the second CDC interface */
-		uint16_t BytesToEcho = CDC_Device_BytesReceived(&VirtualSerial2_CDC_Interface);
-		while (BytesToEcho--)
+		while (CDC_Device_BytesReceived(&VirtualSerial2_CDC_Interface))
 		  CDC_Device_SendByte(&VirtualSerial2_CDC_Interface, CDC_Device_ReceiveByte(&VirtualSerial2_CDC_Interface));
 		  
 		CDC_Device_USBTask(&VirtualSerial1_CDC_Interface);