Add address sanitizer and undefined behavior sanitizer (#951)

sherpa-onnx/csrc/online-transducer-decoder.h

@@ -95,15 +95,15 @@ class OnlineTransducerDecoder {
    * online decoding case, each utterance has the same number of frames
    * and there are no paddings.
    */
-  virtual void Decode(Ort::Value encoder_out, OnlineStream **ss,
-                      std::vector<OnlineTransducerDecoderResult> *result) {
+  virtual void Decode(Ort::Value /*encoder_out*/, OnlineStream ** /*ss*/,
+                      std::vector<OnlineTransducerDecoderResult> * /*result*/) {
     SHERPA_ONNX_LOGE(
         "This interface is for OnlineTransducerModifiedBeamSearchDecoder.");
     exit(-1);
   }
 
   // used for endpointing. We need to keep decoder_out after reset
-  virtual void UpdateDecoderOut(OnlineTransducerDecoderResult *result) {}
+  virtual void UpdateDecoderOut(OnlineTransducerDecoderResult * /*result*/) {}
 };
 
 }  // namespace sherpa_onnx