[patch] Fix BZ#20544 (assert function passed to atexit/on_exit/__cxa_atexit != NULL)

[Florian Weimer]

* Paul Pluzhnikov:

> +        atexit (NULL);  /* Should assert.  */
> +        exit (EXIT_FAILURE);

I think this will print assertion failure messages to the build log,
which is confusing to anyone reviewing it for unexpected errors.  Can we
avoid this?

Thanks,
Florian