devel/dbus: use closefrom()
Don't do 1021 calls to close() when a single closefrom() will do.
This patch has been submitted upstream (by the reporter) but
is languishing there; there's a big difference between upstream's
development branch and the released stable version. I've taken
the initial patch from FreeBSD bugzilla, lightly mutated it with
Reported by: firstname.lastname@example.org