programs/winefile/winefile.c - Fix NULL pointer deref in read_tree

[Rince]

read_tree was dereferencing a NULL pointer passed in from refresh_child, and
the previous patch was apparently kicked back for handling this in the
callee, not the caller.

Tested, resolves bug 10966 for me.

- Rich
-- 

You single-handedly fought your way into this hopeless mess.
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