d3d9: Use wined3d_texture_get_sub_resource_parent() in d3d9_texture_cube_GetCubeMapSurface().

dlls/d3d9/texture.c

@@ -719,7 +719,6 @@ static HRESULT WINAPI d3d9_texture_cube_GetCubeMapSurface(IDirect3DCubeTexture9
         D3DCUBEMAP_FACES face, UINT level, IDirect3DSurface9 **surface)
 {
     struct d3d9_texture *texture = impl_from_IDirect3DCubeTexture9(iface);
-    struct wined3d_resource *sub_resource;
     struct d3d9_surface *surface_impl;
     UINT sub_resource_idx;
     DWORD level_count;
@@ -735,13 +734,12 @@ static HRESULT WINAPI d3d9_texture_cube_GetCubeMapSurface(IDirect3DCubeTexture9
     }
 
     sub_resource_idx = level_count * face + level;
-    if (!(sub_resource = wined3d_texture_get_sub_resource(texture->wined3d_texture, sub_resource_idx)))
+    if (!(surface_impl = wined3d_texture_get_sub_resource_parent(texture->wined3d_texture, sub_resource_idx)))
     {
         wined3d_mutex_unlock();
         return D3DERR_INVALIDCALL;
     }
 
-    surface_impl = wined3d_resource_get_parent(sub_resource);
     *surface = &surface_impl->IDirect3DSurface9_iface;
     IDirect3DSurface9_AddRef(*surface);
     wined3d_mutex_unlock();