[PATCH] Fix potential crash on service name collision.

[oc3an]

Hello,

Here is a patch against the current master branch of the avahi git tree to fix a potential crash on service name collision.

This bug was introduced by commit f7e3b4fab6ba1bc98c6dbe859ccdef4fde6c5db2 (core: Bug fixes for cleanup code)

-Patrick

(I have attempted to send this patch to the mailing list but it doesn't seem to be working)