driver: marke no-destination method calls as _c_unlikely_
driver: marke no-destination method calls as _c_unlikely_

This is just implemented for the sake of completeness, but is not
useful, and very unlikely to be used in practice.

Signed-off-by: Tom Gundersen <7c8224529a7c718e876cb2496c973509fde1e50e@jklm.no>

bus1/dbus-broker