K 10
svn:author
V 7
scottph
K 8
svn:date
V 27
2019-08-19T17:51:06.098206Z
K 7
svn:log
V 361
Don't set the string "unknown" as a device's location_str

Return an empty string when the location is unknown instead of the
string "unknown". This ensures that all location entries are of
the form key=val.

Suggested by:	imp
Approved by:	jhb (mentor)
MFC after:	1 week
Sponsored by:	Intel Corporation
Differential Revision:	https://reviews.freebsd.org/D21326

END