nvme: fix uninitialized prp2 value on small transfers

nvme: fix uninitialized prp2 value on small transfers

The value of iod->first_dma ends up as prp2 in NVMe commands. In case
there is not enough data to cross a page boundary, iod->first_dma is
never initialized and contains random data.

Comply with the NVMe specification and fill in 0 in that case.

Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
(cherry picked from commit 5228b3280b9bb8fa6aef59f891cca64a028e9b36)

Orabug: 27624149

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Ashok Vairavan <ashok.vairavan@oracle.com>