USB: serial: ch341: add debug output for chip version

Will probably be helpful if there are any more compatibility issues.
Signed-off-by: NAidan Thornton <makosoft@gmail.com>
Reviewed-by: NGrigori Goronzy <greg@chown.ath.cx>
Signed-off-by: NJohan Hovold <johan@kernel.org>

drivers/usb/serial/ch341.c

@@ -212,6 +212,7 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
 	r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size);
 	if (r < 0)
 		goto out;
+	dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]);
 
 	r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0);
 	if (r < 0)