qcacld-3.0: Avoid qdf_mem_cpy when source pointer is null

During SAP SSR scan default ie data pointer is cleared and
set to null hence avoid unnecessary qdf_mem_cpy when source
pointer is null.

Change-Id: I75960c69804144abee5b1978b43002110b0d0be4
CRs-Fixed: 2161056

core/sme/src/common/sme_api.c

@@ -14744,6 +14744,9 @@ QDF_STATUS sme_set_default_scan_ie(tHalHandle hal, uint16_t session_id,
 	tpAniSirGlobal mac_ctx = PMAC_STRUCT(hal);
 	struct hdd_default_scan_ie *set_ie_params;
 
+	if (!ie_data)
+		return QDF_STATUS_E_INVAL;
+
 	status = sme_acquire_global_lock(&mac_ctx->sme);
 	if (QDF_IS_STATUS_SUCCESS(status)) {
 		set_ie_params = qdf_mem_malloc(sizeof(*set_ie_params));