Wlan: use proper variable to get the BSSID in IBSS

In __wlan_hdd_cfg80211_join_ibss BSSID is copied in local variable
bssid, but params->bssid is used to get the BSSID.
As params->bssid can be NULL the BSSID in IBSS is set to all 0.

To avoid this use the local variable bssid to get the BSSID.

Change-Id: Iee247a1624fcdfeabbf34a8a94537c18989f2d13
CRs-fixed: 940254
diff --git a/CORE/HDD/src/wlan_hdd_cfg80211.c b/CORE/HDD/src/wlan_hdd_cfg80211.c
index 4d4dc5a..d9fdb06 100644
--- a/CORE/HDD/src/wlan_hdd_cfg80211.c
+++ b/CORE/HDD/src/wlan_hdd_cfg80211.c
@@ -14986,7 +14986,7 @@
 
     /* Issue connect start */
     status = wlan_hdd_cfg80211_connect_start(pAdapter, params->ssid,
-            params->ssid_len, params->bssid, NULL,
+            params->ssid_len, (const u8 *)&bssid, NULL,
             pHddStaCtx->conn_info.operationChannel);
 
     if (0 > status)