[PATCH] stdio-common: Add nonnull attribute to stdio_ext.h functions.

[Collin Funk]

Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> writes:

> LGTM, thanks.
>
> Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Thanks for the review.

Can you push for me? I don't have commit access.

Thanks,
Collin