Fix: Avoid server_cycle in endpoint has been closed and make sure ctx->do_next be defined
Fix: Avoid server_cycle in endpoint has been closed and make sure ctx->do_next be defined

1. Endpoint maybe has been closed , however current context still on shutdown state and hasn't been closed right now. Drop the data directly in this approach and watting for current context be closed
2. ctx->do_next may be null while server_ctx_set_proto hasn't been called.

kenshinx/rps,kenshinx/rps,kenshinx/rps,kenshinx/rps,kenshinx/rps