USB: iuu_phoenix: remove unnecessary urb kill on close

Remove kill of interrupt-in urb on close as it has never been submitted.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/iuu_phoenix.c

@@ -957,7 +957,6 @@ static void iuu_close(struct usb_serial_port *port)
 		dev_dbg(&port->dev, "%s - shutting down urbs\n", __func__);
 		usb_kill_urb(port->write_urb);
 		usb_kill_urb(port->read_urb);
-		usb_kill_urb(port->interrupt_in_urb);
 		iuu_led(port, 0, 0, 0xF000, 0xFF);
 	}
 }