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gbm: fail early when modifier list only contains INVALID

Simon Ser requested to merge emersion/mesa:gbm-detect-mod-invalid into master

The current check only accomodates for a list with a single INVALID item. However the driver won't be able to pick any modifier if the list only contains INVALID. This includes the following cases:

  • The modifier list is empty (count == 0)
  • The modifier list contains more than a single item, but all items are INVALID

In these cases, also fail early.

Signed-off-by: Simon Ser References: !7601 (comment 778845)

cc @rmader @pq @daniels

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