sched/topology: Handle NUMA_NO_NODE in sched_numa_find_nth_cpu()

sched_numa_find_nth_cpu() doesn't handle NUMA_NO_NODE properly, and
may crash kernel if passed with it. On the other hand, the only user
of sched_numa_find_nth_cpu() has to check NUMA_NO_NODE case explicitly.

It would be easier for users if this logic will get moved into
sched_numa_find_nth_cpu().

Signed-off-by: Yury Norov <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: Mel Gorman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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