pan/decode: Validate AFBC fields are zero when AFBC is disabled

There is no "chunknown" structure; that part of the union is an artefact
from falsely believing vertex/tiler MFBDs could have render targets
attached (they can't). These are just plain old AFBC fields, and if
there is no AFBC, it's error to set these field.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
2 files changed