winefile: Don't use child after it has been freed

[Paul TBBle Hampson]

If winefile is run as DISPLAY=wine winefile, it complains it can't
create a window, and crashes. winemine, in
comparison, complaints it can't create a window and exits.

This turns out to be a use-after-free bug.
-- 
Paul "TBBle" Hampson, Paul.Hampson at Pobox.com

Shorter .sig for a more eco-friendly paperless office.
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