fixing dv plugin


git-svn-id: https://gnunet.org/svn/gnunet@31907 140774ce-b5e7-0310-ab8b-a85725594a96
fix memory leak


git-svn-id: https://gnunet.org/svn/gnunet@31908 140774ce-b5e7-0310-ab8b-a85725594a96
simplification for tcp plugin


git-svn-id: https://gnunet.org/svn/gnunet@31909 140774ce-b5e7-0310-ab8b-a85725594a96
fix crash on shutdown


git-svn-id: https://gnunet.org/svn/gnunet@31910 140774ce-b5e7-0310-ab8b-a85725594a96