nvme: Fix incorrect cdw15 value in passthru error logging

Fix an error in nvme_log_err_passthru() where cdw14 was incorrectly
printed twice instead of cdw15. This fix ensures accurate logging of
the full passthrough command payload.

Fixes: 9f079dda ("nvme: allow passthru cmd error logging")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>