nvme-pci: merge nvme_free_iod into nvme_unmap_data
This means we now have a function that undoes everything nvme_map_data does and we can simplify the error handling a bit. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NKeith Busch <keith.busch@intel.com> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Reviewed-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
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