[PATCH] lib: debug: Avoid negative array access.

[David Disseldorp]

On Tue, 18 Apr 2017 15:20:39 +1000, Martin Schwenke via samba-technical wrote:

> > Fix for bug https://bugzilla.samba.org/show_bug.cgi?id=12746.
> > 
> > Please review and push if happy !  
> 
> Reviewed-by: Martin Schwenke <martin at meltin.net>
> 
> Happy for someone to push in batch with other stuff... if I don't see
> it go then I'll push tomorrow morning...  :-)

Pushed to autobuild - thanks!

Cheers, David