fix a syntax error, test=develop (#31930)

paddle/fluid/inference/tests/api/lite_mul_model_test.cc

@@ -75,14 +75,15 @@ int test_predictor_zero_copy(const AnalysisConfig& config_in,
   }
 
   std::vector<float> input({1});
-  auto in_tensor{predictor->GetInputTensor(predictor->GetInputNames().front())};
+  auto in_tensor =
+      predictor->GetInputTensor(predictor->GetInputNames().front());
   in_tensor->Reshape({1, 1});
   in_tensor->copy_from_cpu(input.data());
 
   predictor->ZeroCopyRun();
 
-  auto out_tensor{
-      predictor->GetOutputTensor(predictor->GetOutputNames().front())};
+  auto out_tensor =
+      predictor->GetOutputTensor(predictor->GetOutputNames().front());
   std::vector<float> data_o(10);
   out_tensor->copy_to_cpu(data_o.data());