ddraw: Don't return a pointer to the implementation in IDirect3DDeviceImpl_7_QueryInterface().

dlls/ddraw/device.c

@@ -175,7 +175,7 @@ IDirect3DDeviceImpl_7_QueryInterface(IDirect3DDevice7 *iface,
         TRACE("(%p) Returning IDirect3DDevice3 interface at %p\n", This, *obj);
     }
     else if ( IsEqualGUID( &IID_IDirect3DDevice7  , refiid ) ) {
-        *obj = This;
+        *obj = &This->IDirect3DDevice7_iface;
         TRACE("(%p) Returning IDirect3DDevice7 interface at %p\n", This, *obj);
     }