Fix for SetupDiGetDeviceInterfaceDetailW

[Christopher]

Change log:
SetupDiGetDeviceInterfaceDetail returns a necessary buffer size that is 
too small, and this causes a page fault when a buffer of the "necessary" 
size is allocated and used. This patch fixes 
SetupDiGetDeviceInterfaceDetailW, and begins to address bug #12242

Christopher Berner
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