setupapi: SetupDiGetClassDevsExW should ignore DIGCF_ALLCLASSES if class set

[Mark Harmstone]

The specs say that DIGCF_ALLCLASSES and class should be mutually 
exclusive, but Windows silent ignores the flag if they are both set. 
Without this patch, a bug in Rocksmith causes it to fail when 
enumerating USB devices.

---
  dlls/setupapi/devinst.c | 2 ++
  1 file changed, 2 insertions(+)


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