hso: Fix unused variable warning

Fallout from the TIOCGICOUNT work
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/hso.c

@@ -1745,7 +1745,6 @@ static int hso_serial_ioctl(struct tty_struct *tty, struct file *file,
 			    unsigned int cmd, unsigned long arg)
 {
 	struct hso_serial *serial =  get_serial_by_tty(tty);
-	void __user *uarg = (void __user *)arg;
 	int ret = 0;
 	D4("IOCTL cmd: %d, arg: %ld", cmd, arg);