qcacld-3.0: Prevent Null pointer access during tdls exit

qcacld-2.0 to qcacld-3.0 propagation

Prevent Null pointer access during tdls exit.

Change-Id: I76f5896ae4c51d4816cc0389151e1e27b07d2193
CRs-Fixed: 1017282
(cherry picked from commit bfed788cb89d39092c755cb35b6a6aa4b8772503)

core/sme/src/common/sme_api.c

@@ -10165,12 +10165,15 @@ QDF_STATUS sme_update_fw_tdls_state(tHalHandle hHal, void *psmeTdlsParams,
 	tpAniSirGlobal pMac = NULL;
 	cds_msg_t cds_message;
 
+	pMac = PMAC_STRUCT(hHal);
+	if (NULL == pMac) {
+		QDF_TRACE(QDF_MODULE_ID_SME, QDF_TRACE_LEVEL_ERROR,
+			FL("pMac is Null"));
+		return QDF_STATUS_E_FAILURE;
+	}
+
 	/* only acquire sme global lock before state update if asked to */
 	if (useSmeLock) {
-		pMac = PMAC_STRUCT(hHal);
-		if (NULL == pMac)
-			return QDF_STATUS_E_FAILURE;
-
 		status = sme_acquire_global_lock(&pMac->sme);
 		if (QDF_STATUS_SUCCESS != status)
 			return status;