fix for core key exchange


git-svn-id: https://gnunet.org/svn/gnunet@31309 140774ce-b5e7-0310-ab8b-a85725594a96
- log


git-svn-id: https://gnunet.org/svn/gnunet@31310 140774ce-b5e7-0310-ab8b-a85725594a96