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

[Alexandre Julliard]

Dan Kegel <dank at kegel.com> writes:

> 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 ;-)

-- 
Alexandre Julliard
julliard at winehq.org