perf cpumap: Use perf_cpu_map__nr(cpus) to access cpus->nr

So that we can have a single point where to refcount check 'struct perf_cpu_map'
instances for use after free, etc.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexey Bayduraev <[email protected]>
Cc: Dmitriy Vyukov <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Riccardo Mancini <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Stephen Brennan <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]
[ Split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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