Fix backend linter errors

pkg/datasource/zabbix_test.go

@@ -8,8 +8,6 @@ import (
 	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
 )
 
-var emptyParams = map[string]interface{}{}
-
 var basicDatasourceInfo = &backend.DataSourceInstanceSettings{
 	ID:       1,
 	Name:     "TestDatasource",
@@ -17,13 +15,6 @@ var basicDatasourceInfo = &backend.DataSourceInstanceSettings{
 	JSONData: []byte(`{"username":"username", "password":"password", "cacheTTL":"10m", "authType":"token"}`),
 }
 
-func mockZabbixQuery(method string, params zabbix.ZabbixAPIParams) *zabbix.ZabbixAPIRequest {
-	return &zabbix.ZabbixAPIRequest{
-		Method: method,
-		Params: params,
-	}
-}
-
 func MockZabbixDataSource(body string, statusCode int) *ZabbixDatasourceInstance {
 	zabbixSettings, _ := settings.ReadZabbixSettings(basicDatasourceInfo)
 	zabbixClient, _ := zabbix.MockZabbixClient(basicDatasourceInfo, body, statusCode)