pcmcia: synclink_cs: fix prototype for mgslpc_ioctl()

The ioctl file pointer was removed in commit 6caa76
"tty: now phase out the ioctl file pointer for good".

Thus fix the prototype for mgslpc_ioctl() and eliminate below warning:
  CC [M]  drivers/char/pcmcia/synclink_cs.o
drivers/char/pcmcia/synclink_cs.c:2787: warning: initialization from incompatible pointer type
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/char/pcmcia/synclink_cs.c

@@ -2222,13 +2222,12 @@ static int mgslpc_get_icount(struct tty_struct *tty,
  * Arguments:
  *
  * 	tty	pointer to tty instance data
- * 	file	pointer to associated file object for device
  * 	cmd	IOCTL command code
  * 	arg	command argument/context
  *
  * Return Value:	0 if success, otherwise error code
  */
-static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
+static int mgslpc_ioctl(struct tty_struct *tty,
 			unsigned int cmd, unsigned long arg)
 {
 	MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;