Merge tag 'libnvdimm-fixes-5.15-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fix from Dan Williams:

 - Fix a regression introduced in v5.15-rc6 that caused nvdimm namespace
   shutdown to hang due to reworks in the block layer q_usage_count.

* tag 'libnvdimm-fixes-5.15-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nvdimm/pmem: stop using q_usage_count as external pgmap refcount