setupapi: Always return an empty list from SetupDiGetClassDevs.

[Hans Leidekker]

This patch and the previous one fix 

  http://bugs.winehq.org/show_bug.cgi?id=7493

 -Hans

Changelog
  Always return an empty list from SetupDiGetClassDevs.
  Set last error to ERROR_NO_MORE_ITEMS in SetupDiEnumDeviceInfo.
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