Merge branch 'nvme-5.1' of git://git.infradead.org/nvme into for-5.1/block

Pull NVMe changes for 5.1 from Christoph

* 'nvme-5.1' of git://git.infradead.org/nvme: (22 commits)
  nvme-rdma: use nr_phys_segments when map rq to sgl
  nvmet: convert to SPDX identifiers
  nvmet-rdma: convert to SPDX identifiers
  nvme-loop: convert to SPDX identifiers
  nvmet-fcloop: convert to SPDX identifiers
  nvmet-fc: convert to SPDX identifiers
  nvme: convert to SPDX identifiers
  nvme-pci: convert to SPDX identifiers
  nvme-lightnvm: convert to SPDX identifiers
  nvme-rdma: convert to SPDX identifiers
  nvme-fc: convert to SPDX identifiers
  nvme-fabrics: convert to SPDX identifiers
  nvme-tcp.h: fix SPDX header
  nvme_ioctl.h: remove duplicate GPL boilerplate
  nvme: return error from nvme_alloc_ns()
  nvme: avoid that deleting a controller triggers a circular locking complaint
  nvme: introduce a helper function for controller deletion
  nvme: unexport nvme_delete_ctrl_sync()
  nvme-pci: check kstrtoint() return value in queue_count_set()
  nvme-fabrics: document the poll function argument
  ...