libs/wine: don't try to read() a directory

[Dan Kegel]

On Wed, Dec 9, 2009 at 5:06 AM, Alexandre Julliard <julliard at winehq.org> wrote:
>> Fixes http://bugs.winehq.org/show_bug.cgi?id=20942
>
> Introducing an fd leak to fix a Valgrind warning is not much of an
> improvement ;-)

d'oh!