rndis_wlan: remove pointless check from rndis_scan()

In rndis_scan(), 'request' is actually always valid pointer and
the !request check is unneeded, so remove it.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rndis_wlan.c

@@ -1959,9 +1959,6 @@ static int rndis_scan(struct wiphy *wiphy,
 	 */
 	rndis_check_bssid_list(usbdev, NULL, NULL);
 
-	if (!request)
-		return -EINVAL;
-
 	if (priv->scan_request && priv->scan_request != request)
 		return -EBUSY;