[C] Fix dangling pointer in replay merge. #1723
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If an error occurs during replay merge, in aeron_async_destination_poll(), async_destination gets freed but never gets set to null.
If aeron_archive_replay_merge_close() is then called to clean up, aeron_archive_replay_merge_handle_async_destination() gets invoked again, which dereferences a dangling replay_merge->async_destination.