Merge PR #68413 into main

* refs/pull/68413/head:
	mds: fix shutdown hang when ephemeral pins active and max_mds is 0
	mds: fix crash in hash_into_rank_bucket() when max_mds is 0

Reviewed-by: Patrick Donnelly <pdonnell@ibm.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>