d3d8: Disallow index buffers in the scratch pool.

dlls/d3d8/buffer.c

@@ -573,6 +573,9 @@ HRESULT indexbuffer_init(struct d3d8_indexbuffer *buffer, struct d3d8_device *de
     struct wined3d_buffer_desc desc;
     HRESULT hr;
 
+    if (pool == D3DPOOL_SCRATCH)
+        return D3DERR_INVALIDCALL;
+
     desc.byte_width = size;
     desc.usage = (usage & WINED3DUSAGE_MASK) | WINED3DUSAGE_STATICDECL;
     if (pool == D3DPOOL_SCRATCH)

dlls/d3d8/tests/device.c

@@ -9132,7 +9132,7 @@ static void test_resource_access(void)
 
         hr = IDirect3DDevice8_CreateIndexBuffer(device, 16, tests[i].usage,
                 tests[i].format == FORMAT_COLOUR ? D3DFMT_INDEX32 : D3DFMT_INDEX16, tests[i].pool, &ib);
-        todo_wine_if(tests[i].pool == D3DPOOL_SCRATCH || tests[i].usage & ~D3DUSAGE_DYNAMIC)
+        todo_wine_if(tests[i].pool != D3DPOOL_SCRATCH && tests[i].usage & ~D3DUSAGE_DYNAMIC)
             ok(hr == (tests[i].pool == D3DPOOL_SCRATCH || (tests[i].usage & ~D3DUSAGE_DYNAMIC)
                     ? D3DERR_INVALIDCALL : D3D_OK), "Test %u: Got unexpected hr %#x.\n", i, hr);
         if (FAILED(hr))