bug#31946: 27.0.50; The NSM should warn about more TLS problems

[Eli Zaretskii]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Mon, 26 Aug 2019 19:19:56 +0100
> 
> On Mon 26 Aug 2019, Eli Zaretskii wrote:
> 
> >> Agreed, but master built from commit 1071a4f still crashes in the same
> >> way:
> >
> > Can you show a recipe?
> 
> 1) Delete ~/.emacs.d/network-security.data (to ensure NSM will query the 
> user).
> 2) Run "emacs -Q"
> 3) "M-x list-packages", and at the NSM prompt, answer 'a' or 's' or 'd'.

Looks like something is wrong with how I'm using gnutls_free when it
comes from the DLL.  I need to look into that.

> >> Removing both xfree(out.data) and xfree(out_buf) from the end of
> >> that function does give me a running emacs.
> >
> > It may run, but it leaks memory.
> 
> Agreed - it is a data point to explore the problem rather than a
> solution.

The xmalloc is actually not needed at all, because we can create the
Lisp string directly.  But that's not the problem here, the problem
is the call to gnutls_free.