Do not drop vpn connection if packet arrived is larger than MTU
Sometimes server sends us packets that are larger than negotiated MTU.
Current implementation bails out in this case.
This patch makes openconnect to reserve space and handle incoming packets
that have size up to 16384 (to match CSTP).
This improves connection stability.
Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>