channel_send_request.
(do_server_session_event): Ignore CHANNEL_EVENT_SUCCESS and
CHANNEL_EVENT_FAILURE.

* src/channel_forward.c (do_channel_forward_event): Ignore
CHANNEL_EVENT_SUCCESS and CHANNEL_EVENT_FAILURE.
* src/gateway_channel.c (do_gateway_channel_event): Likewise.
* src/socks.c (do_socks_channel_event): Likewise.

Rev: src/channel_forward.c:1.18
Rev: src/gateway_channel.c:1.28
Rev: src/server_session.c:1.107
Rev: src/socks.c:1.7