[avahi] incomplete avahi cleanup ?

[Gaspard Bucher]

After removing errors generated by my own code, I found incomplete
cleanup errors from avahi code (simple-publish-client.c). To make sure
it finishes, I changed the modify_callback by a quit_callback.

Full code with valgrind output: http://gist.github.com/109158

I don't know if these errors can build up into more annoying stuff and
if they are in avahi or the libdbus library.

Gaspard