[Bug 223600] vnic: kernel panic when running tcpdump

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223600

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A commit references this bug:

Author: emaste
Date: Fri Nov 10 22:17:30 UTC 2017
New revision: 325683
URL: https://svnweb.freebsd.org/changeset/base/325683

Log:
  vnic: apply BPF tap before passing packet to hardware

  Previously we passed tx packets to hardware via nicvf_tx_mbuf_locked
  and then to the BPF tap, with a possibly invalid mbuf which would result
  in a panic.

  PR:           223600
  Discussed with:       bz
  MFC after:    1 week
  Sponsored by: The FreeBSD Foundation, Packet.net (hardware)

Changes:
  head/sys/dev/vnic/nicvf_queues.c

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