remove extra tensor move action

Author: Gasoonjia

extension/asr/runner/runner.cpp

@@ -256,7 +256,6 @@ Result<std::vector<int64_t>> AsrRunner::transcribe(
   // Use encoder output sequence length as "prompt tokens" for throughput
   stats_.num_prompt_tokens =
       static_cast<int64_t>(encoder_output_tensor.size(1));
-  std::move(encoder_outputs[0]).toTensor();
 
   ET_LOG(
       Info,