nvme-pci: remove unnecessary completion doorbell check
The nvme pci driver never unmaps the doorbell registers while the requests are active, so we can always safely update the completion queue head. Signed-off-by: NKeith Busch <keith.busch@intel.com> Reviewed-by: NJens Axboe <axboe@kernel.dk> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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