bus: don't broadcast a message to its explicit destination
bus: don't broadcast a message to its explicit destination

When a filter indicates a destination, then the message is already
being unicast to that destination, and it should be excluded from
the broadcast to avoid duplicates.

We still need to do regular duplicate detection on destinations,
but that is a separate issue.

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

bus1/dbus-broker