shell32: Fix return type for helper functions of SHFileOption.

[Zhenbo Li]

SHFileOperation returns int, but its helper functions return DWORD.
Although there should be no real world problems, this patch can make the 
code clear.

Thanks to Matteo Bruni's suggestion.

---
  dlls/shell32/shlfileop.c | 11 ++++++-----
  1 file changed, 6 insertions(+), 5 deletions(-)


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