Function winapi::um::setupapi::SetupDiClassNameFromGuidExA

pub unsafe extern "system" fn SetupDiClassNameFromGuidExA(
    ClassGuid: *const GUID, 
    ClassName: PSTR, 
    ClassNameSize: DWORD, 
    RequiredSize: PDWORD, 
    MachineName: PCSTR, 
    Reserved: PVOID
) -> BOOL