If `glamor_get_modifiers` returns no modifiers, but succeeds, it means
that modifiers are implicit and chosen by the driver
(e.g. when allocating gbm buffers)
If we strip all modifiers however, it means that from the list
of modifiers we queried, we can use none.
This means that it would be an error to, for example,
create a gbm bo, create an image from it and try to
render into it.
We should treat this case as a failure.
Signed-off-by: stefan11111 <stefan11111@shitposting.expert>
dc55d361d8