qcacld-3.0: Do not send unified stats command in disconnect state

Currently driver sends unified ll stats command to request ll_stats
and station stats even if station is in disconnected state.

There are no stats required in disconnected state and fw does not
collect any stats in disconnected case. If host requests station
stats in disconnected case, fw sends all stats as 0s, so there is
no need to request these stats in disconnected case.

To address above issue, add a check to not send unified ll_stats
command in disconnected case.

Change-Id: I9701830d2e671020e564a42d2d866de420cfa0a4
CRs-Fixed: 3186240

core/hdd/src/wlan_hdd_stats.c

@@ -1970,9 +1970,9 @@ wlan_hdd_set_station_stats_request_pending(struct hdd_adapter *adapter)
 	info.pdev_id = wlan_objmgr_pdev_get_pdev_id(wlan_vdev_get_pdev(vdev));
 	peer = wlan_objmgr_vdev_try_get_bsspeer(vdev, WLAN_OSIF_STATS_ID);
 	if (!peer) {
-		osif_err("peer is null");
+		osif_err("peer is null hence get_ll_stats is not supported");
 		hdd_objmgr_put_vdev_by_user(vdev, WLAN_OSIF_STATS_ID);
-		return QDF_STATUS_E_INVAL;
+		return QDF_STATUS_E_BADMSG;
 	}
 
 	adapter->hdd_stats.is_ll_stats_req_in_progress = true;
@@ -2075,6 +2075,9 @@ static int wlan_hdd_send_ll_stats_req(struct hdd_adapter *adapter,
 	if (status == QDF_STATUS_E_ALREADY)
 		return qdf_status_to_os_return(status);
 
+	if (status == QDF_STATUS_E_BADMSG)
+		return QDF_STATUS_SUCCESS;
+
 	/*
 	 * FW can send radio stats with multiple events and for the first event
 	 * host allocates memory in wma and processes the events, there is a