net: hso: drop unused function argument

_hso_serial_set_termios() doesn't use it's second argument, so it can be
dropped.
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20210811171321.18317-1-paskripkin@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/usb/hso.c

@@ -1079,8 +1079,7 @@ static void hso_init_termios(struct ktermios *termios)
 	tty_termios_encode_baud_rate(termios, 115200, 115200);
 }
 
-static void _hso_serial_set_termios(struct tty_struct *tty,
-				    struct ktermios *old)
+static void _hso_serial_set_termios(struct tty_struct *tty)
 {
 	struct hso_serial *serial = tty->driver_data;
 
@@ -1262,7 +1261,7 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp)
 	if (serial->port.count == 1) {
 		serial->rx_state = RX_IDLE;
 		/* Force default termio settings */
-		_hso_serial_set_termios(tty, NULL);
+		_hso_serial_set_termios(tty);
 		tasklet_setup(&serial->unthrottle_tasklet,
 			      hso_unthrottle_tasklet);
 		result = hso_start_serial_device(serial->parent, GFP_KERNEL);
@@ -1394,7 +1393,7 @@ static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
 	/* the actual setup */
 	spin_lock_irqsave(&serial->serial_lock, flags);
 	if (serial->port.count)
-		_hso_serial_set_termios(tty, old);
+		_hso_serial_set_termios(tty);
 	else
 		tty->termios = *old;
 	spin_unlock_irqrestore(&serial->serial_lock, flags);