fix typo (#66)

sherpa-ncnn/csrc/endpoint.cc

@@ -63,7 +63,7 @@ bool Endpoint::IsEndpoint(const int num_frames_decoded,
   float trailing_silence = trailing_silence_frames * frame_shift_in_seconds;
   if (RuleActivated(config_.rule1, "rule1", trailing_silence,
                     utterance_length) ||
-      RuleActivated(config_.rule1, "rule2", trailing_silence,
+      RuleActivated(config_.rule2, "rule2", trailing_silence,
                     utterance_length) ||
       RuleActivated(config_.rule3, "rule3", trailing_silence,
                     utterance_length)) {