wlan: Reset isPnoEnable flag on failure of start PNO scan.

Reset 'isPnoEnable' flag upon failure to send
'WLAN_HAL_SET_PREF_NETWORK_REQ' to firmware or firmware sends
failure as response to this request.

Change-Id: I574f0813a7722bd1906162de88f7542b8c59a655
CRs-Fixed: 710866
diff --git a/CORE/HDD/src/wlan_hdd_cfg80211.c b/CORE/HDD/src/wlan_hdd_cfg80211.c
index 9f104e5..36bffd2 100644
--- a/CORE/HDD/src/wlan_hdd_cfg80211.c
+++ b/CORE/HDD/src/wlan_hdd_cfg80211.c
@@ -12658,8 +12658,12 @@
         return;
     }
 
-    VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
+    if (VOS_STATUS_SUCCESS != status)
+    {
+        VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
               FL("PNO enable response status = %d"), status);
+        pHddCtx->isPnoEnable = FALSE;
+    }
 
     pAdapter->pno_req_status = (status == VOS_STATUS_SUCCESS) ? 0 : -EBUSY;
     complete(&pAdapter->pno_comp_var);