cem 27c89ceaea teken: Unbreak syscons' use of teken
Only vt(4) initializes these callbacks non-NULL at this time, so invoke the
function pointers conditionally.

Broken in r333669.

Submitted by:	bde@
2018-05-16 18:12:49 +00:00
..
2018-05-16 18:12:49 +00:00