delete the variable which is never used (#2294)

src/application/application.cpp

@@ -85,7 +85,7 @@ void Application::LoadData() {
   std::unique_ptr<Predictor> predictor;
   // prediction is needed if using input initial model(continued train)
   PredictFunction predict_fun = nullptr;
-  PredictionEarlyStopInstance pred_early_stop = CreatePredictionEarlyStopInstance("none", LightGBM::PredictionEarlyStopConfig());
+  
   // need to continue training
   if (boosting_->NumberOfTotalModel() > 0 && config_.task != TaskType::KRefitTree) {
     predictor.reset(new Predictor(boosting_.get(), -1, true, false, false, false, -1, -1));