sched: Fix migrate_swap() vs. hotplug

Phil Auldrequested to merge
prauld/centos-stream-9:rhel107437 into main

JIRA: https://issues.redhat.com/browse/RHEL-107437

Two fixes from upstream are needed for commits we have in
the rhel9 tree.

Signed-off-by: Phil Auld pauld@redhat.com

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