[MERGE] crash when "bzr add" (under win32)

[Kuno Meyer]

Just a small fix for a bug under Win32 introduced while refactoring. By 
the way, are there any (explicit) tests for win32utils.glob_expand? I 
didn't find any.

Kuno

PS: This is my first patch, so please let me know if I'm doing anything 
wrong ;-)

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