Michael Tuexen 47384244f9 Fix an issue I introuced in r367530: tcp_twcheck() can be called
with to == NULL for SYN segments. So don't assume tp != NULL.
Thanks to jhb@ for reporting and suggesting a fix.

PR:			250499
MFC after:		1 week
XMFC-with:		r367530
Sponsored by:		Netflix, Inc.
2020-11-20 13:00:28 +00:00
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