- removed double-free after set has freed its set already

git-svn-id: https://gnunet.org/svn/gnunet@33395 140774ce-b5e7-0310-ab8b-a85725594a96
- fixed a double-free-race upon failing a set op

git-svn-id: https://gnunet.org/svn/gnunet@33396 140774ce-b5e7-0310-ab8b-a85725594a96
- fixed the same bug on bob's side as on alice's side in copying over element data in the SP-api. seems like this correction got lost somewhere

git-svn-id: https://gnunet.org/svn/gnunet@33397 140774ce-b5e7-0310-ab8b-a85725594a96