dsound: Avoid casts from COM object to interface.

[Andrew Eikum]

On Thu, Dec 08, 2016 at 11:29:42AM +0100, Michael Stefaniuc wrote:
> Signed-off-by: Michael Stefaniuc <mstefani at redhat.de>
> ---
>  dlls/dsound/dsound.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/dlls/dsound/dsound.c b/dlls/dsound/dsound.c
> index 43b252d..d11c864 100644
> --- a/dlls/dsound/dsound.c
> +++ b/dlls/dsound/dsound.c
> @@ -452,8 +452,8 @@ static HRESULT DirectSoundDevice_CreateSoundBuffer(
>  
>          if (device->primary) {
>              WARN("Primary Buffer already created\n");
> -            IDirectSoundBuffer_AddRef((LPDIRECTSOUNDBUFFER8)(device->primary));
> -            *ppdsb = (LPDIRECTSOUNDBUFFER)(device->primary);
> +            *ppdsb = (IDirectSoundBuffer *)&device->primary->IDirectSoundBuffer8_iface;
> +            IDirectSoundBuffer_AddRef(*ppdsb);
>          } else {

Changing the order of these statements makes me nervous. Some
applications use the returned pointers before the function returns,
see 6a7c2f66e0569d2419eb9619e78716a9a5f94966.

Andrew