K 10
svn:author
V 6
tmunro
K 8
svn:date
V 27
2018-10-28T10:59:49.232139Z
K 7
svn:log
V 326
truss: Fix display of shm_open(SHM_ANON, ...).

Currently truss(1) shows shm_open(SHM_ANON, ...) as shm_open("(null)", ...).
Detect the special value and display it by name.

Reviewed by:    jhb, allanjude, tuexen
Approved by:    mjg (mentor)
MFC with:       r339224
Differential Revision:  https://reviews.freebsd.org/D17461

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