Add sync block where a race condition may occur

git-svn-id: http://svn.igniterealtime.org/svn/repos/wildfire/trunk@5962 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/wildfire/http/HttpBindServlet.java

@@ -108,7 +108,9 @@ public class HttpBindServlet extends HttpServlet {
         if (connection == null) {
             return false;
         }
+        synchronized (connection.getSession()) {
             respond(response, connection);
+        }
         return true;
     }