zb: Drop lifetimes from MessageSink
By using synchronous locking. Fortunately, we don't need to maintain a lock on the socket during the only two async method of Sink implementation so we can just always get the lock in these methods.
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By using synchronous locking. Fortunately, we don't need to maintain a lock on the socket during the only two async method of Sink implementation so we can just always get the lock in these methods.