- fixed use after free due to uncanceled task


git-svn-id: https://gnunet.org/svn/gnunet@30903 140774ce-b5e7-0310-ab8b-a85725594a96
- log as debug when ibf fails to decode, instead of warning


git-svn-id: https://gnunet.org/svn/gnunet@30904 140774ce-b5e7-0310-ab8b-a85725594a96