qcacld-3.0: Take vdev ref only if vdev is not NULL

In functions ucfg_tdls_update_rx_pkt_cnt and
ucfg_tdls_update_tx_pkt_cnt, driver tries
to get the vdev ref, even if it is NULL.
This can result in assert.

Change-Id: I62b3a9b088324e06518e82203092a2ac9098ac13
CRs-Fixed: 2412095

tdls/dispatcher/src/wlan_tdls_ucfg_api.c

@@ -933,26 +933,14 @@ void ucfg_tdls_update_rx_pkt_cnt(struct wlan_objmgr_vdev *vdev,
 				 struct qdf_mac_addr *mac_addr,
 				 struct qdf_mac_addr *dest_mac_addr)
 {
-	QDF_STATUS status;
-	status = wlan_objmgr_vdev_try_get_ref(vdev, WLAN_TDLS_NB_ID);
-	if (status != QDF_STATUS_SUCCESS)
-		return;
 	tdls_update_rx_pkt_cnt(vdev, mac_addr, dest_mac_addr);
 
-	wlan_objmgr_vdev_release_ref(vdev, WLAN_TDLS_NB_ID);
 }
 
 void ucfg_tdls_update_tx_pkt_cnt(struct wlan_objmgr_vdev *vdev,
 				 struct qdf_mac_addr *mac_addr)
 {
-	QDF_STATUS status;
-	status = wlan_objmgr_vdev_try_get_ref(vdev, WLAN_TDLS_NB_ID);
-	if (status != QDF_STATUS_SUCCESS)
-		return;
 	tdls_update_tx_pkt_cnt(vdev, mac_addr);
-
-	wlan_objmgr_vdev_release_ref(vdev, WLAN_TDLS_NB_ID);
-
 }
 
 QDF_STATUS ucfg_tdls_antenna_switch(struct wlan_objmgr_vdev *vdev,