ddraw: Use wined3d_resource_unmap() in d3d_vertex_buffer7_Unlock().

dlls/ddraw/vertexbuffer.c

@@ -309,7 +309,7 @@ static HRESULT WINAPI d3d_vertex_buffer7_Unlock(IDirect3DVertexBuffer7 *iface)
     TRACE("iface %p.\n", iface);
 
     wined3d_mutex_lock();
-    wined3d_buffer_unmap(buffer->wined3d_buffer);
+    wined3d_resource_unmap(wined3d_buffer_get_resource(buffer->wined3d_buffer), 0);
     wined3d_mutex_unlock();
 
     return D3D_OK;