K 10
svn:author
V 4
avos
K 8
svn:date
V 27
2019-03-20T07:40:38.591510Z
K 7
svn:log
V 267
lockf(1): return EX_UNAVAILABLE if -n is used and the lock file does not
exist

Apply EX_UNAVAILABLE patch part from PR 170775 to match the documentation.

Checked with a command from PR 210770:
lockf -n /tmp/doesnotexist echo; echo $?

PR:		210770
MFC after:	1 week

END