USB: ch341: forward USB errors to USB serial core

All error messages from stack in open are being forwarded except for
one call to usb_submit_urb. Change this for consistency.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 8607f15..0e77511 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -340,7 +340,7 @@
 		dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 			" error %d\n", __func__, r);
 		ch341_close(port);
-		return -EPROTO;
+		goto out;
 	}
 
 	r = usb_serial_generic_open(tty, port);