Enji Cooper 88cbf2928f Use .Dv when referencing NULL
This is the correct markup macro, as opposed to .Va (variable names)

While here, annotate several bare references to `NULL` with .Dv.

MFC after:	1 week
Sponsored by:	Dell EMC Isilon
2017-03-12 05:07:33 +00:00
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2017-03-12 05:07:33 +00:00
2017-02-24 06:49:31 +00:00