tweak

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12581 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_limit/mod_limit.c

@@ -322,7 +322,7 @@ static switch_status_t db_state_handler(switch_core_session_t *session)
 		switch_safe_free(sql);
 		switch_core_event_hook_remove_state_change(session, db_state_handler);
 		/* Remove limit_realm variable so we register another hook if limit is called again */
-		switch_channel_set_variable(channel, "limit_realm", "");
+		switch_channel_set_variable(channel, "limit_realm", NULL);
 	}
 	return SWITCH_STATUS_SUCCESS;
 }