Merge "libgui: Fix missing va_end in Surface::hook_perform()"

    va_list args;

    va_start(args, operation);

    Surface* c = getSelf(window);

    return c->perform(operation, args);

    int result = c->perform(operation, args);

    va_end(args);

    return result;

}

int Surface::setSwapInterval(int interval) {