Only finalize mapped all from Go when map entry exists #12
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There was still a double finalization race, detected by the panic introduced by the previous commit. If setErr() is called during client teardown, all currently managed calls will be errored and finalized, and the calls map set to nil.
Unfortunately, Client.Go was again finalizing the call even after setErr released the calls mutex, because it had a another variable pointing to it.
To fix this race, look up the call entry in the map and only finalize and delete it when it present.