Plain C version with attribute((__cleanup)):

    int* foo(int bar) {
        int* return_value = NULL;

        __cleanup__((cleanup_1)) int c1 = 0;
        if (!do_something(bar))
            return NULL;
        __cleanup__((cleanup_2)) int c2 = 0;
        if (!init_stuff(bar))
            return NULL;
        __cleanup__((cleanup_3)) int c3 = 0;
        if (!prepare_stuff(bar))
            return NULL;
        return_value = do_the_thing(bar);

        return return_value;
    }