FreeBSD/src c1176e6 (r336356)sys/dev/e1000 if_em.c

Update igb_sctx_init for r336313, missed when incorporating shurd@'s
feedback on the initial D15720.

Reported by:    kib
DeltaFile
+3-2sys/dev/e1000/if_em.c
+3-21 files

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