nvme-pci: fix psdt field for single segment sgls
The shortcut for single segment SGL requests did not set the PSDT field to mark the request as using SGLs. Fixes: 29791057 ("nvme-pci: optimize mapping single segment requests using SGLs") Signed-off-by: NKlaus Birkelund Jensen <klaus.jensen@cnexlabs.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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