nvme: fix NULL pointer dereference in nvme_init_subsystem
When using nvme-pci driver the nvmf_ctrl_options is NULL. There is no need to check for discovery_nqn flag at non-fabrics controller. Fixes: 181303d0 ("nvme-fabrics: allow duplicate connections to the discovery controller") Signed-off-by: NIsrael Rukshin <israelr@mellanox.com> Reviewed-by: NMax Gurtovoy <maxg@mellanox.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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