Fixes tags need work in the ceph tree

[Mark Brown]

In commit

  591569339cb56 ("ceph: fix MDS random selection readiness predicate")

Fixes tag

  Fixes: b38c9eb4757d ("ceph: allow choose random mds")

has these problem(s):

  - Subject does not match target commit subject
    Just use
	git log -1 --format='Fixes: %h ("%s")'

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