FreeBSD/src c53d6b9 (r343162)sys/netinet siftr.c

Make SIFTR work again after r342125 (D18443).

Correct a logic error.

Only disable when already enabled or enable when disabled.

Submitted by:   Richard Scheffenegger
Reviewed by:    Cheng Cui
Obtained from:  Cheng Cui
MFC after:      3 days
Differential Revision:  https://reviews.freebsd.org/D18885
DeltaFile
+11-6sys/netinet/siftr.c
+11-61 files

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