user: pass NULL to charge a user for its own resources
user: pass NULL to charge a user for its own resources

This is simply a short-hand to make the common case of a user being charged
for its own resources simpler.

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

bus1/dbus-broker