USB: keyspan_pda: 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/keyspan_pda.c

@@ -649,13 +649,8 @@ static int keyspan_pda_open(struct tty_struct *tty,
 }
 static void keyspan_pda_close(struct usb_serial_port *port)
 {
-	struct usb_serial *serial = port->serial;
-
-	if (serial->dev) {
-		/* shutdown our bulk reads and writes */
-		usb_kill_urb(port->write_urb);
-		usb_kill_urb(port->interrupt_in_urb);
-	}
+	usb_kill_urb(port->write_urb);
+	usb_kill_urb(port->interrupt_in_urb);
 }