USB: cyberjack: remove bogus disconnect test in close

Remove bogus (and unnecessary) test for serial->dev being NULL in close.

The device is never cleared, and close is never called after a completed
disconnect anyway.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/cyberjack.c

@@ -166,11 +166,8 @@ static int  cyberjack_open(struct tty_struct *tty,
 
 static void cyberjack_close(struct usb_serial_port *port)
 {
-	if (port->serial->dev) {
-		/* shutdown any bulk reads that might be going on */
 	usb_kill_urb(port->write_urb);
 	usb_kill_urb(port->read_urb);
-	}
 }
 
 static int cyberjack_write(struct tty_struct *tty,