usb: misc: uss720: remove redundant pointer usbdev

Pointer usbdev is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'usbdev' set but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/uss720.c

@@ -748,13 +748,11 @@ static void uss720_disconnect(struct usb_interface *intf)
 {
 	struct parport *pp = usb_get_intfdata(intf);
 	struct parport_uss720_private *priv;
-	struct usb_device *usbdev;
 
 	dev_dbg(&intf->dev, "disconnect\n");
 	usb_set_intfdata(intf, NULL);
 	if (pp) {
 		priv = pp->private_data;
-		usbdev = priv->usbdev;
 		priv->usbdev = NULL;
 		priv->pp = NULL;
 		dev_dbg(&intf->dev, "parport_remove_port\n");