qcacld-3.0: Channel selection failure during SAP restart

Channel selection for changing SAP operating channel fails if the ACS
channel list is empty in SAP context. This leads to SAP operating on
disabled channel after country code change. Modified to return successfully
without filtering the pcl in empty acs channel list cases.

Change-Id: If252e9dc4dad300892848d2add85bf121d52ae21
CRs-Fixed: 3042093

core/sap/src/sap_module.c

@@ -2855,13 +2855,20 @@ QDF_STATUS wlansap_filter_ch_based_acs(struct sap_context *sap_ctx,
 	size_t ch_index;
 	size_t target_ch_cnt = 0;
 
-	if (!sap_ctx || !ch_freq_list || !ch_cnt ||
-	    !sap_ctx->acs_cfg->master_freq_list ||
-	    !sap_ctx->acs_cfg->master_ch_list_count) {
+	if (!sap_ctx || !ch_freq_list || !ch_cnt) {
 		sap_err("NULL parameters");
 		return QDF_STATUS_E_FAULT;
 	}
 
+	if (!sap_ctx->acs_cfg->acs_mode) {
+		sap_debug("acs not enabled, no filtering required");
+		return QDF_STATUS_SUCCESS;
+	} else if (!sap_ctx->acs_cfg->master_freq_list ||
+		   !sap_ctx->acs_cfg->master_ch_list_count) {
+		sap_err("Empty acs channel list");
+		return QDF_STATUS_E_FAULT;
+	}
+
 	for (ch_index = 0; ch_index < *ch_cnt; ch_index++) {
 		if (wlansap_is_channel_present_in_acs_list(
 					ch_freq_list[ch_index],