d3d10core: Remove a superfluous pointer cast.

dlls/d3d10core/d3d10core_main.c

@@ -80,7 +80,7 @@ static HRESULT WINAPI layer_create(enum dxgi_device_layer_id id, void **layer_ba
         return E_NOTIMPL;
     }
 
-    object = (struct d3d10_device *)*layer_base;
+    object = *layer_base;
 
     object->vtbl = &d3d10_device_vtbl;
     object->inner_unknown_vtbl = &d3d10_device_inner_unknown_vtbl;