[PATCH/v2] Use size_t for mallinfo fields.

[DJ Delorie]

Adhemerval Zanella <adhemerval.zanella@linaro.org> writes:
> Patch LGTM with some nits below.
>
> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

Thanks!  I'll fix the nits as suggested while waiting for other
reviewers.