Oops - serial stream driver should return _FDEV_EOF when no data has been received, not EOF.

LUFA/Drivers/Peripheral/SerialStream.c

@@ -46,7 +46,7 @@ static int SerialStream_RxByte(FILE *Stream)
 	(void)Stream;
 	
 	if (!(Serial_IsCharReceived()))
-	  return EOF;
+	  return _FDEV_EOF;
 
 	return Serial_RxByte();
 }