Gleb Smirnoff 78a7880f64 Fix a crash in tcp_input(), that happens when mbuf has a fwd_tag on it,
but later after processing and freeing the tag, we need to jump back again
to the findpcb label. Since the fwd_tag pointer wasn't NULL we tried to
process and free the tag for second time.

Reported & tested by:	Pawel Tyll <ptyll nitronet.pl>
MFC after:		3 days
2012-12-12 17:41:21 +00:00
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