nvmet: don't try to add ns to p2p map unless it actually uses it
Even without CONFIG_P2PDMA this results in a error print: nvmet: no peer-to-peer memory is available that's supported by rxe0 and /dev/nullb0 Fixes: c6925093 ("nvmet: Optionally use PCI P2P memory") Signed-off-by: NSagi Grimberg <sagi@grimberg.me> Reviewed-by: NLogan Gunthorpe <logang@deltatee.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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