mos7720: bury dead TIOCM... in ->ioctl()

These ioctls never reach driver's ->ioctl() - tty_ioctl() handles
them on its own.  ->tiocm[gs]et() is what actually gets called,
and mos7720 provides those, with results equivalent to what the
unreachable code would be doing when called.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/usb/serial/mos7720.c

@@ -1786,51 +1786,6 @@ static int mos7720_tiocmset(struct tty_struct *tty,
 	return 0;
 }
 
-static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
-			  unsigned int __user *value)
-{
-	unsigned int mcr;
-	unsigned int arg;
-
-	struct usb_serial_port *port;
-
-	if (mos7720_port == NULL)
-		return -1;
-
-	port = (struct usb_serial_port *)mos7720_port->port;
-	mcr = mos7720_port->shadowMCR;
-
-	if (copy_from_user(&arg, value, sizeof(int)))
-		return -EFAULT;
-
-	switch (cmd) {
-	case TIOCMBIS:
-		if (arg & TIOCM_RTS)
-			mcr |= UART_MCR_RTS;
-		if (arg & TIOCM_DTR)
-			mcr |= UART_MCR_RTS;
-		if (arg & TIOCM_LOOP)
-			mcr |= UART_MCR_LOOP;
-		break;
-
-	case TIOCMBIC:
-		if (arg & TIOCM_RTS)
-			mcr &= ~UART_MCR_RTS;
-		if (arg & TIOCM_DTR)
-			mcr &= ~UART_MCR_RTS;
-		if (arg & TIOCM_LOOP)
-			mcr &= ~UART_MCR_LOOP;
-		break;
-
-	}
-
-	mos7720_port->shadowMCR = mcr;
-	write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
-		      mos7720_port->shadowMCR);
-
-	return 0;
-}
-
 static int get_serial_info(struct moschip_port *mos7720_port,
 			   struct serial_struct __user *retinfo)
 {
@@ -1868,13 +1823,6 @@ static int mos7720_ioctl(struct tty_struct *tty,
 		return get_lsr_info(tty, mos7720_port,
 					(unsigned int __user *)arg);
 
-	/* FIXME: These should be using the mode methods */
-	case TIOCMBIS:
-	case TIOCMBIC:
-		dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
-		return set_modem_info(mos7720_port, cmd,
-				      (unsigned int __user *)arg);
-
 	case TIOCGSERIAL:
 		dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
 		return get_serial_info(mos7720_port,