d3d8: Don't return a pointer to the implementation in IDirect3DVolume8Impl_QueryInterface().

dlls/d3d8/volume.c

@@ -31,18 +31,18 @@ static inline IDirect3DVolume8Impl *impl_from_IDirect3DVolume8(IDirect3DVolume8
 static HRESULT WINAPI IDirect3DVolume8Impl_QueryInterface(IDirect3DVolume8 *iface, REFIID riid,
         void **ppobj)
 {
-    IDirect3DVolume8Impl *This = impl_from_IDirect3DVolume8(iface);
-
     TRACE("iface %p, riid %s, object %p.\n", iface, debugstr_guid(riid), ppobj);
 
-    if (IsEqualGUID(riid, &IID_IUnknown)
-        || IsEqualGUID(riid, &IID_IDirect3DVolume8)) {
+    if (IsEqualGUID(riid, &IID_IDirect3DVolume8)
+            || IsEqualGUID(riid, &IID_IUnknown))
+    {
         IUnknown_AddRef(iface);
-        *ppobj = This;
+        *ppobj = iface;
         return S_OK;
     }
 
-    WARN("(%p)->(%s,%p),not found\n", This, debugstr_guid(riid), ppobj);
+    WARN("%s not implemented, returning E_NOINTERFACE.\n", debugstr_guid(riid));
+
     *ppobj = NULL;
     return E_NOINTERFACE;
 }