dleyna: Fix crash determining local IPv6 address

Avoid a crash when determining the local IPv6 address due to a shadowed
variable.

https://bugzilla.gnome.org/show_bug.cgi?id=740052
flickr: do not create object twice

When GOA_ENABLED we are creating twice a GFlickr object, when only once is
needed.
bookmarks: remove useless assignment

It is assigned later in a loop.