Per-connection socket instances we currently maintain three fields related to the socket: a reference to the Socket unit, the connection fd, and a reference to the SocketPeer object that counts socket peers. Let's synchronize their lifetime, i.e. always set them all three together or unset them together, so that their reference counters stay synchronous. THis will in particuar ensure that we'll drop the SocketPeer reference whenever we leave an active state of the service unit, i.e. at the same time we close the fd for it. Fixes: #20685
System and Service Manager
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