[PATCH] Handle PACKET_TAG_IPFORWARD and TIMEWAIT state

[Ed Maste]

SVN rev 244157 introduced a fix for a crash in tcp_input() which would
occur in the case of a packet with a PACKET_TAG_IPFORWARD m_tag arriving
for a flow in TIMEWAIT.  Such packets resulted in a goto findpcb an a
double free of the m_tag.

Unfortunately the fix causes the fwd_tag to be lost for any subsequent
trips through the pcb lookup code.  The attached patch keeps the fwd_tag
around until finished with pcb lookup.

The #ifdef INET / INET6 is a bit torturous, but no worse than what was
there.
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