staging: csr: fix compilation warning in unifi_siwscan

got the warnings

drivers/staging/csr/sme_wext.c: In function ‘unifi_siwscan’:
drivers/staging/csr/sme_wext.c:1276:9: warning: variable ‘scantype’ set but not used [-Wunused-but-set-variable]

fixed by removing the variable
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/csr/sme_wext.c

@@ -1273,7 +1273,6 @@ unifi_siwscan(struct net_device *dev, struct iw_request_info *info,
 {
     netInterface_priv_t *interfacePriv = (netInterface_priv_t *)netdev_priv(dev);
     unifi_priv_t *priv = interfacePriv->privPtr;
-    int scantype;
     int r;
     CsrWifiSsid scan_ssid;
     unsigned char *channel_list = NULL;
@@ -1293,8 +1292,6 @@ unifi_siwscan(struct net_device *dev, struct iw_request_info *info,
     }
 
 
-    scantype = UNIFI_SCAN_ACTIVE;
-
 #if WIRELESS_EXT > 17
     /* Providing a valid channel list will force an active scan */
     if (req) {