解决connection模块写时，出现往空的channel写的panic错误 #286
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…channel写数据的panic错误
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为了不使用锁，此处去掉主动关闭close(c.msgBuffChan) 让系统自动GC 该channel。可避免写数据时出现竞争：往关闭的channel写数据的panic错误