prima: Assign requestId instead of sessionId while extscan stop

When extscan stop is issued, sessionId is passed for requestId
in hdd ext scan context, which is causing a timeout error.
This commit ensures to pass requestId instead of sessionId.

CRs-Fixed: 982332
Change-Id: I132033f2405730ae19c344d78232a5af3528a76d
diff --git a/CORE/HDD/src/wlan_hdd_cfg80211.c b/CORE/HDD/src/wlan_hdd_cfg80211.c
index e674027..d866727 100644
--- a/CORE/HDD/src/wlan_hdd_cfg80211.c
+++ b/CORE/HDD/src/wlan_hdd_cfg80211.c
@@ -4822,7 +4822,7 @@
     context = &pHddCtx->ext_scan_context;
     spin_lock(&hdd_context_lock);
     INIT_COMPLETION(context->response_event);
-    context->request_id = request_id = reqMsg.sessionId;
+    context->request_id = request_id = reqMsg.requestId;
     spin_unlock(&hdd_context_lock);
 
     status = sme_EXTScanStop(pHddCtx->hHal, &reqMsg);