[Bug 197923] [patch] [sched] Fix comment in sched_balance_pair and move load check ahead of lock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197923

--- Comment #12 from Mark Johnston <markj at FreeBSD.org> ---
(In reply to Harrison Grundy from comment #11)
It is possible that the queues will end up unbalanced again immediately after
they are unlocked, but sched_balance_pair() has to lock the queues to perform
the migration anyway, so it might as well cheaply verify that it's doing the
right thing before performing an expensive migration.

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