avauddec: Fix crash on stop()
GstFFMpegAudDec.context can be nullptr if decoder got closed without opening new context. Note that we don't need to clear AVCodecContext.extradata there since avcodec_free_context() will do clear the data if needed.
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GstFFMpegAudDec.context can be nullptr if decoder got closed without opening new context. Note that we don't need to clear AVCodecContext.extradata there since avcodec_free_context() will do clear the data if needed.