Michael Tuexen 9b1246ca38 Fix a bug where the wrong protocol overhead was used. This can lead
to a deadlock of an association when an IPv6 socket was used to
communcate with IPv4 and an ICMPv4 fragmentation needed message
was received.
While there, simplify the code a bit.

MFC after: 3 days.
2012-02-14 12:00:34 +00:00
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