Some minor improvements

* destroy/free/shutdown/close in reverse order of allocation
* more static/auto_Xfree
* less variables/strlen/GString
* properly `\0`-terminate string of testcase

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

src/xmpp/chat_session.c

@@ -69,8 +69,8 @@ static void
 _chat_session_free(ChatSession* session)
 {
     if (session) {
-        free(session->barejid);
         free(session->resource);
+        free(session->barejid);
         free(session);
     }
 }