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svn:author
V 4
avos
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svn:date
V 27
2019-03-27T08:55:59.478706Z
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svn:log
V 266
MFC r345318:
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.

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

PR:		210770

END