修复ssrc缓存初始化判断错误，导致初始化失败

648540858

2023-09-15 2d11f1b3ded261a0602dcd8ecdca05d459645be5

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package com.genersoft.iot.vmp.service.bean;
 
public interface PlayBackCallback<T> {
 
    void call(PlayBackResult<T> msg);
 
}