Fix twain device handle corruption

[Alexandre Julliard]

Francois Gouget <fgouget at codeweavers.com> writes:

>   * or we could check that config.h has been included first using
> something like:
>
> #ifndef __WINE_CONFIG_H
> # error You must include config.h first
> #endif

I think that's preferable, we really want to be using the same
structure everywhere.

-- 
Alexandre Julliard
julliard at winehq.org