xaudio2_{7, 8}: Implement IXaudio interface as stub (try 2)

[Nikolay Sivov]

> +static const struct IXAudio2Vtbl XAudio2_Vtbl;

You wouldn't need this if you've moved XAudio2_create() after vtbl 
declaration.

> +
> +HRESULT XAudio2_create(IUnknown *pUnkOuter, LPVOID *ppObj)

Please use better names, and "void **".

> +{
> +    IXAudio2Impl* object;
> +
> +    TRACE("(%p, %p)\n", pUnkOuter, ppObj);
> +
> +    if(pUnkOuter)
> +        return CLASS_E_NOAGGREGATION;
> +
> +    object = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IXAudio2Impl));
> +    if(!object)
> +        return E_OUTOFMEMORY;

No need for HEAP_ZERO_MEMORY.

> +
> +    *ppObj = object;

That's not how it's done - return proper interface pointer.


>  HRESULT WINAPI DllRegisterServer(void)
>  {
>      TRACE("\n");
> -    return __wine_register_resources( instance );
> +    return __wine_register_resources(instance);
>  }

You can probably leave this as it is.