unexpected packets.
(channel_close_handler): Don't display the "unexpected channel
close" message if CHANNEL_NO_WAIT_FOR_EOF is set.
Don't invoke the CHANNEL_EOF callback.
(channel_eof): Use the new CHANNEL_NO_WAIT_FOR_EOF flag.
(init_channel): Set CHANNEL_CLOSE_AT_EOF by default.
(channel_read_close_callback): Improved comment.

Rev: src/channel.c:1.94