I can find no reason to allow packets with both SYN and FIN bits
set past this point in the code. The packet should be dropped and
not massaged as it is here.
Differential Revision: https://reviews.freebsd.org/D2266
Submitted by: eri
Sponsored by: Rubicon Communications (Netgate)
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head/sys/netpfil/pf/pf_norm.c