libertas: stop attempting to reset devices on unload

It wasn't working anyway -- by the time we get into if_usb_disconnect()
the USB core has already stopped us talking to the thing; even if it's
just on unload and the device still exists.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/if_usb.c

@@ -278,16 +278,11 @@ static void if_usb_disconnect(struct usb_interface *intf)
 	cardp->surprise_removed = 1;
 
 	if (priv) {
-
 		priv->surpriseremoved = 1;
 		lbs_stop_card(priv);
 		lbs_remove_card(priv);
 	}
 
-	/* this is (apparently?) necessary for future usage of the device */
-	lbs_prepare_and_send_command(priv, CMD_802_11_RESET, CMD_ACT_HALT,
-			0, 0, NULL);
-
 	/* Unlink and free urb */
 	if_usb_free(cardp);