Staging: serqt_usb2: fix qt_open parameters

The parameter list for qt_open() was from the old non usb-serial
driver.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/serqt_usb2/serqt_usb2.c

@@ -874,7 +874,7 @@ static void qt_release(struct usb_serial *serial)
 }
 
 static int qt_open(struct tty_struct *tty,
-	    struct usb_serial_port *port, struct file *filp)
+		   struct usb_serial_port *port)
 {
 	struct usb_serial *serial;
 	struct quatech_port *quatech_port;