Fix leak of soup logger instances
Fix leak of soup logger instances

When adding a feature, the soup session takes a reference on the feature, so we
need to unref it after adding in order for it not to leak.

http://bugs.meego.com/show_bug.cgi?id=2500

Distrotech/librest,ThomasBollmeier/librest-oauth-proxy,Distrotech/librest,ThomasBollmeier/librest-oauth-proxy,GNOME/librest,GNOME/librest,GNOME/librest