fix an issue with forgetting to unlock #430
Merged
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这里好像忘了放锁,可能导致系统卡住。
其中一个可能卡住的点是:由于这里没有放锁,导致check_dead_nodes卡住(拿不到replicator的锁);但是check_dead_nodes已经在handle_stepdown_timeout持有braft::NodeImpl::_mutex。进而导致后续所有需要拿braft::NodeImpl::_mutex的地方都被卡住。整个Node不可用。