There is no point in releasing a lock on a file which we've unlinked and are about to close, so don't.  As a bonus, pidfile_remove(3) will now work with an fcntl(2)-based flopen(3).
There is no point in releasing a lock on a file which we've unlinked and
are about to close, so don't.  As a bonus, pidfile_remove(3) will now
work with an fcntl(2)-based flopen(3).

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