Don't send anything in response to a SSH_MSG_CHANNEL_REQUEST if we have already sent a SSH_MSG_CHANNEL_CLOSE. This fixes a bug triggered by more recent versions of putty with tcp fowarding and window adjustment request messages.

#!/bin/sh
exec 2>&1
exec dropbear -d ./dropbear_dss_host_key -r ./dropbear_rsa_host_key -F -E -p 22