nvme: pass nr_maps explicitly to nvme_alloc_io_tag_set

nvme: pass nr_maps explicitly to nvme_alloc_io_tag_set

[ Upstream commit 2f9757b5ae39640d4984af661e8918470b10bcd0 ]

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

Fixes: 00e0ae2ac0c4 ("nvme-fc: use the tagset alloc/free helpers")
Fixes: 9ed94e92a057 ("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>