ID3D11DeviceContext::RSGetState returns a Result<>, should be an Option<>

[rokbok]

Summary

ID3D11DeviceContext::RSGetState returns a Result<>. However, according to the docs, this function cannot fail. So I assume an error is returned when the C++ function returns null. This is a bit misleading, because nothing went wrong. The function should return None instead in this case

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[kennykerr]

I've been torn about whether this should be fixed or whether this is more consistent the way it is. Since many/most APIs return a COM interface using Result<T>, it would make this API different without a compelling reason to be different.