USB: oti6858: forward USB errors to USB serial core

Forward errors from usb_submit_urb in open.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index 6770ad0..2161d1c 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -585,7 +585,7 @@
 		dev_err(&port->dev, "%s(): usb_submit_urb() failed"
 			       " with error %d\n", __func__, result);
 		oti6858_close(port);
-		return -EPROTO;
+		return result;
 	}
 
 	/* setup termios */