Remove unused code and fix gosimple linting error

internal/services/policy/assignment_base_resource.go

@@ -339,8 +339,6 @@ func (br assignmentBaseResource) arguments(fields map[string]*pluginsdk.Schema)
 		"non_compliance_message": {
 			Type:     pluginsdk.TypeList,
 			Optional: true,
-			//ConfigMode: pluginsdk.SchemaConfigModeAttr,
-			//Set:        br.resourceAssignmentBaseResourceNonComplianceMessageHash,
 			Elem: &pluginsdk.Resource{
 				Schema: map[string]*pluginsdk.Schema{
 					"message": {
@@ -409,25 +407,12 @@ func (br assignmentBaseResource) flattenIdentity(input *policy.Identity) []inter
 	return policyAssignmentIdentity{}.Flatten(config)
 }
 
-/* func (br assignmentBaseResource) resourceAssignmentBaseResourceNonComplianceMessageHash(v interface{}) int {
-	var buf bytes.Buffer
-
-	if m, ok := v.(map[string]interface{}); ok {
-		buf.WriteString(fmt.Sprintf("%s-", m["message"].(string)))
-		if v, ok := m["policy_definition_reference_id"]; ok {
-			buf.WriteString(v.(string))
-		}
-	}
-
-	return pluginsdk.HashString(buf.String())
-} */
-
 func (br assignmentBaseResource) flattenNonComplianceMessages(input *[]policy.NonComplianceMessage) []interface{} {
 	results := make([]interface{}, 0)
 
 	if input != nil {
 		for _, v := range *input {
-			output := make(map[string]interface{}, 0)
+			output := make(map[string]interface{})
 			output["message"] = v.Message
 			if v.PolicyDefinitionReferenceID != nil {
 				output["policy_definition_reference_id"] = *v.PolicyDefinitionReferenceID