USB: fix error handling for mct_u232

we report errors to the caller. THis patch adds error handling to the driver.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/mct_u232.c

@@ -438,17 +438,21 @@ static int  mct_u232_open (struct usb_serial_port *port, struct file *filp)
 	if (retval) {
 		err("usb_submit_urb(read bulk) failed pipe 0x%x err %d",
 		    port->read_urb->pipe, retval);
-		goto exit;
+		goto error;
 	}
 
 	port->interrupt_in_urb->dev = port->serial->dev;
 	retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
-	if (retval)
+	if (retval) {
+		usb_kill_urb(port->read_urb);
 		err(" usb_submit_urb(read int) failed pipe 0x%x err %d",
 		    port->interrupt_in_urb->pipe, retval);
-
-exit:
+		goto error;
+	}
 	return 0;
+
+error:
+	return retval;
 } /* mct_u232_open */