[1.x] AudioBridge 中发生分段错误

Today, Janus crashed with a segmentation fault. After checking logs and core file, I noticed it was a call to `opus_encoder_ctl` by the AudioBridge plugin which caused it. In `src/plugins/janus_audiobridge.c` there are 44 calls to that function, but I am focusing on the ones which use `participant->encoder`. The following one in `janus_audiobridge_handler` seems suspicious to me: