If adapter_gl_destroy_unordered_access_view() is called before
wined3d_unordered_access_view_gl_cs_init() has finished executing, the
"counter_bo" field may still be 0. More generally, we shouldn't access
the "counter_bo" field from outside the CS thread.
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>