proc: use macro in /proc/latency hook
->latency_record is defined as struct latency_record[LT_SAVECOUNT]; so use the same macro whie iterating. Link: http://lkml.kernel.org/r/20180627200534.GA18434@avx2Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com> Reviewed-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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