libata: remove assumption that ATA_MAX_QUEUE - 1 is the max
In a few spots we iterate to ATA_MAX_QUEUE -1, including internal knowledge that the last tag is the internal tag. Remove this assumption. Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Tejun Heo <tj@kernel.org>
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