K 10
svn:author
V 4
ngie
K 8
svn:date
V 27
2017-03-12T05:07:33.968568Z
K 7
svn:log
V 215
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

END