[PATCH] nss_dns: Enforce QDCOUNT == 1 in getnetby* implementation

[DJ Delorie]

Florian Weimer <fweimer@redhat.com> writes:
> The stub resolver sends a query with one question record, so if
> the answer contains a different number, the DNS message is
> corrupted.

The resolver now returns a different error code when question_count is
zero.  Is this intentional?  Does this need to be documented anywhere?

> +    if (n < 0 || end_of_message - (cp + n) < QFIXEDSZ)
> +      goto bad_message;

And this part sets errno, which it didn't before.