nvme: pass nr_maps explicitly to nvme_alloc_io_tag_set

nvme: pass nr_maps explicitly to nvme_alloc_io_tag_set

[ Upstream commit dcef77274ae52136925287b6b59d5c6e6a4adfb9 ]

Don't look at ctrl->ops as only RDMA and TCP actually support multiple
maps.

Fixes: 6dfba1c09c10 ("nvme-fc: use the tagset alloc/free helpers")
Fixes: ceee1953f923 ("nvme-loop: use the tagset alloc/free helpers")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>