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1b1a9b3163
If a callback still holds a reference on the client, then it may be about to perform an rpc call, so it isn't safe to call rpc_shutdown(). (Though rpc_shutdown() does wait for any outstanding rpc's, it can't know if a new rpc is about to be issued with that client.) So, wait to shutdown the rpc_client until the reference count on the client has gone to zero. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>