Wifi-HAL: Fix addba_failed related unintialized pointer

The diag event buffer is being dereferenced without being
initialized incase of the addba_failure event. Fixing a
stability issue wrt the event.

Change-Id: Id5e4fd8a88a65b9c7fe40cdbe35c39ed561fe5bb
diff --git a/qcwcn/wifi_hal/wifilogger_diag.cpp b/qcwcn/wifi_hal/wifilogger_diag.cpp
index 7bd8d0f..3c73630 100644
--- a/qcwcn/wifi_hal/wifilogger_diag.cpp
+++ b/qcwcn/wifi_hal/wifilogger_diag.cpp
@@ -486,6 +486,7 @@
     pConnectEvent = (wifi_ring_buffer_driver_connectivity_event *)
                      (pRingBufferEntry + 1);
 
+    pAddBAFailed = (wlan_add_block_ack_failed_payload_type *)buf;
     addBAFailedVenData.ucBaTid = pAddBAFailed->ucBaTid;
     addBAFailedVenData.fInitiator = pAddBAFailed->fInitiator;