With VK_EXT_robustness2, descriptors can be NULL and the number of samples returned by nir_texop_texture_samples should be 0. Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4775>