flickr: do not create object twice
flickr: do not create object twice

When GOA_ENABLED we are creating twice a GFlickr object, when only once is
needed.

GNOME/grilo-plugins,MathieuDuponchelle/grilo-plugins,grilofw/grilo-plugins,GNOME/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,jasuarez/grilo-plugins,jasuarez/grilo-plugins,grilofw/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins