[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 #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Mon Oct 20 03:17:49 UTC 2014
New revision: 273300
URL: https://svnweb.freebsd.org/changeset/base/273300

Log:
  MFS10 r273296 (r273219 in HEAD):

    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
  Approved by:    re

Changes:
_U  releng/10.1/
  releng/10.1/sys/dev/vt/vt_core.c

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