mesa/st: don't use serialized_nir for cached shaders

serialized_nir doesn't exist here, so just use the cached nir

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11051

Fixes: 5eb0136a3c5 ("mesa/st: when creating draw shader variants, use the base nir and skip driver opts")

Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28857>
1 file changed