lookup_modifier_or_null
const struct intel_modifier_desc *md = lookup_modifier_or_null(modifier);
md = lookup_modifier_or_null(fb_modifier);
tiling_caps = lookup_modifier_or_null(fb_modifier)->plane_caps &
const struct intel_modifier_desc *md = lookup_modifier_or_null(modifier);
const struct intel_modifier_desc *md = lookup_modifier_or_null(modifier);