-fix error message

git-svn-id: https://gnunet.org/svn/gnunet@33134 140774ce-b5e7-0310-ab8b-a85725594a96
Removing compile warnings
Adding a new message type, tear down. 


git-svn-id: https://gnunet.org/svn/gnunet@33135 140774ce-b5e7-0310-ab8b-a85725594a96