[Bug 192248] [vt] panic in vtbuf_fill_locked from vt_upgrade with no vt(4) drivers attached

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192248

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Fri Oct 17 13:55:46 UTC 2014
New revision: 273219
URL: https://svnweb.freebsd.org/changeset/base/273219

Log:
  Do nothing in vt_upgrade if there is no vt driver

  Previously, if no drivers attached at boot we would panic with
  "vtbuf_fill_locked begin.tp_row 0 must be < screen height 0".

  PR:        192248
  Reviewed by:    ray
  MFC after:    3 days
  Sponsored by:    DARPA, AFRL
  Differential Revision: https://reviews.freebsd.org/D954

Changes:
  head/sys/dev/vt/vt_core.c

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