tiocmset: kill the file pointer argument

Doing tiocmget was such fun we should do tiocmset as well for the same
reasons

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index aa0962b..5cbef31 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -431,7 +431,7 @@
 	kfree(break_reg);
 }
 
-static int ch341_tiocmset(struct tty_struct *tty, struct file *file,
+static int ch341_tiocmset(struct tty_struct *tty,
 			  unsigned int set, unsigned int clear)
 {
 	struct usb_serial_port *port = tty->driver_data;