staging: serqt_usb2: Clean up initializations of variables

static void qt_close(struct usb_serial_port *port)

{

	struct usb_serial *serial = port->serial;

	struct quatech_port *qt_port;

	struct quatech_port *port0;

	struct tty_struct *tty;

	unsigned int index;

	tty = tty_port_tty_get(&port->port);

	index = port->port_number;

	qt_port = qt_get_port_private(port);

	port0 = qt_get_port_private(serial->port[0]);

	struct tty_struct *tty = tty_port_tty_get(&port->port);

	unsigned int index = port->port_number;

	struct quatech_port *qt_port = qt_get_port_private(port);

	struct quatech_port *port0 = qt_get_port_private(serial->port[0]);

	/* shutdown any bulk reads that might be going on */

	if (serial->num_bulk_out)