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
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head/usr.bin/lockf/lockf.c