Double check that we do not use a freed buffer when freeing a session

Double check that we do not use a freed buffer when freeing a session

This is a find cases where the session already has planned to send out
a packet but encounters some other errors that invalidate the session,
setting it to S_ERROR and leaving the buffer behind.

This will detect and clear that to_link buffer in that case.

Change-Id: I5ffb41bed1c9237946b13d787eb4c4013e0bec68
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: David Sommerseth <davids@openvpn.net>
Acked-by: Heiko Hund <heiko@ist.eigentlich.net>
Message-Id: <20231108124947.76816-2-gert@greenie.muc.de>
URL: https://www.mail-archive.com/search?l=mid&q=20231108124947.76816-2-gert@greenie.muc.de
Signed-off-by: Gert Doering <gert@greenie.muc.de>