fix possible memory leak of funasr-wss-client (#1913)

Johntheprime

2024-07-16 685550515ed823d92226c873ab3811037f1aad5b

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wget https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/dep_libs/ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz
tar -xvf ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz