dsound: Avoid casts from COM object to interface.

[Michael Stefaniuc]

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 {
             hres = primarybuffer_create(device, &device->primary, dsbd);
             if (device->primary) {
-- 
2.7.4