Clears the current client; usually called from the client finalizer.
Note that the client does not need to be unregistered here, as the epoll selector always unregisters the client after calling its finalizer.
true if there actually was a current client or false otherwise.
See Implementation
Clears the current client; usually called from the client finalizer.
Note that the client does not need to be unregistered here, as the epoll selector always unregisters the client after calling its finalizer.