ControlUSB(): return a negative value in case of error instead of STATUS_UNSUCCESSFUL (0xFB)
ControlUSB(): return a negative value in case of error instead of
STATUS_UNSUCCESSFUL (0xFB)

The calling code is checking for a negative return value so we adapt the
API to its usage.


git-svn-id: d8b078d517c8be834637447f210d7177f0fa38d6@6096 0ce88b0d-b2fd-0310-8134-9614164e65ea

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