qcacld-3.0: Add pointer validation check lim_send_probe_req_mgmt_frame()

Add pointer validation check for variable 'additional_ie' in
lim_send_probe_req_mgmt_frame() API before derefernce it.

Change-Id: I83f24b0707b129445b3b6bcdb84a5572aa4f0ccd
CRs-Fixed: 2232743

core/mac/src/pe/lim/lim_send_management_frames.c

@@ -347,7 +347,7 @@ lim_send_probe_req_mgmt_frame(tpAniSirGlobal mac_ctx,
 	pe_debug("Populate HE IEs");
 	populate_dot11f_he_caps(mac_ctx, pesession, &pr.he_cap);
 
-	if (addn_ielen) {
+	if (addn_ielen && additional_ie) {
 		qdf_mem_zero((uint8_t *)&extracted_ext_cap,
 			sizeof(tDot11fIEExtCap));
 		sir_status = lim_strip_extcap_update_struct(mac_ctx,