[trac657] Remove nop operation

Not directly related to the ticket, I just discovered a call that does
nothing (it is called with null pointer and the function checks the
parameter is not null, if it is, it just does nothing).

src/bin/auth/main.cc

@@ -176,13 +176,8 @@ main(int argc, char* argv[]) {
         auth_server->setXfrinSession(xfrin_session);
         auth_server->setStatisticsSession(statistics_session);
 
-        // Configure the server.  configureAuthServer() is expected to install
-        // all initial configurations, but as a short term workaround we
-        // handle the traditional "database_file" setup by directly calling
-        // updateConfig().
         auth_server->setConfigSession(config_session);
         configureAuthServer(*auth_server, config_session->getFullConfig());
-        auth_server->updateConfig(ElementPtr());
 
         cout << "[b10-auth] Server started." << endl;
         io_service.run();