Fix bug of r232207, when cpu_search() could prefer CPU group with best load, but with no CPU matching given limitations. It caused kernel panics in some cases when thread was bound to specific CPUs with cpuset(1).
Fix bug of r232207, when cpu_search() could prefer CPU group with best
load, but with no CPU matching given limitations. It caused kernel panics
in some cases when thread was bound to specific CPUs with cpuset(1).

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