dhcpcd: Fix warning about literal comparison
dhcpcd: Fix warning about literal comparison

I guess Python doesn't guarantee that there's only a single instance
of the empty tuple (even though this is true in CPython), so it now
gives warnings about this.  Fixed.

MurphyMc/pox,MurphyMc/pox,MurphyMc/pox,MurphyMc/pox,MurphyMc/pox