removing useless fixme comment


git-svn-id: https://gnunet.org/svn/gnunet@31953 140774ce-b5e7-0310-ab8b-a85725594a96
fix use after free and mantis 0003257


git-svn-id: https://gnunet.org/svn/gnunet@31954 140774ce-b5e7-0310-ab8b-a85725594a96