USB: adutux: remove redundant variable minor

Variable minor is being assigned but never read, hence it is redundant
and can be removed. Cleans up clang warning:

drivers/usb/misc/adutux.c:770:2: warning: Value stored to 'minor' is
never read

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/misc/adutux.c

···
 static void adu_disconnect(struct usb_interface *interface)
 {
 	struct adu_device *dev;
-	int minor;
 
 	dev = usb_get_intfdata(interface);
 
 	mutex_lock(&dev->mtx);	/* not interruptible */
 	dev->udev = NULL;	/* poison */
-	minor = dev->minor;
 	usb_deregister_dev(interface, &adu_class);
 	mutex_unlock(&dev->mtx);