Re: [PATCH v6 12/12] nvme-rdma: factor out the scatterlist DMA mapping helper

The data and the metadata mapping do the same thing: describe the
segments blk_rq_map_sg() produced in a local sg_table -- the embedded
one's orig_nents is the allocated size, not the valid-segment count --
map that, and hand back the DMA-mapped count.  Fold both into a
helper.

No functional change.

Suggested-by: Logan Gunthorpe <logang@deltatee.com>
Assisted-by: Claude:claude-fable-5
Signed-off-by: Mykola Marzhan <redacted>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260726113229.2154269-1-mykola@meshstor.io?part=12