Instead of using the virt_ptr use request buffer for copying
back the nvmd response data and use the same in request function also
Signed-off-by: NSuresh Thiagarajan <suresh.thiagarajan@pmcs.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>