shell32/tests: Prevent crash on XP/W2K3

[Ge van Geldorp]

I'm not sure I fully understand why, but initializing to NULL instead of a
double-nul terminated string prevents crashes that I see in
SHFileOperationA on some XP and W2K3 machines.

Changelog:
  Prevent crash on XP/W2K3

---
 dlls/shell32/tests/shlfileop.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)



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