usb/serial: fix function args warnings, dropping *filp

Fix build warnings caused by removal of *filp arg in struct
usb_serial_driver.

These changes were missed somehow in commits 00a0d0d65b61 ("tty: remove
filp from the USB tty ioctls") and 60b33c133ca0b ("tiocmget: kill off
the passing of the struct file")

  drivers/usb/serial/mct_u232.c:159: warning: initialization from incompatible pointer type
  drivers/usb/serial/opticon.c:627: warning: initialization from incompatible pointer type

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/usb/serial/mct_u232.c

@@ -106,7 +106,7 @@ static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
 static int  mct_u232_tiocmget(struct tty_struct *tty);
 static int  mct_u232_tiocmset(struct tty_struct *tty,
 			unsigned int set, unsigned int clear);
-static int  mct_u232_ioctl(struct tty_struct *tty, struct file *file,
+static int  mct_u232_ioctl(struct tty_struct *tty,
 			unsigned int cmd, unsigned long arg);
 static int  mct_u232_get_icount(struct tty_struct *tty,
 			struct serial_icounter_struct *icount);
@@ -874,7 +874,7 @@ static void mct_u232_unthrottle(struct tty_struct *tty)
 	}
 }
 
-static int  mct_u232_ioctl(struct tty_struct *tty, struct file *file,
+static int  mct_u232_ioctl(struct tty_struct *tty,
 			unsigned int cmd, unsigned long arg)
 {
 	DEFINE_WAIT(wait);

drivers/usb/serial/opticon.c

@@ -413,7 +413,7 @@ static int opticon_tiocmget(struct tty_struct *tty)
 	return result;
 }
 
-static int opticon_tiocmset(struct tty_struct *tty, struct file *file,
+static int opticon_tiocmset(struct tty_struct *tty,
 			   unsigned int set, unsigned int clear)
 {
 	struct usb_serial_port *port = tty->driver_data;