perf stat: Factor out evsel__count_has_error()

It's possible to have 0 enabled/running time for some per-task or per-cgroup
events since it's not scheduled on any CPU.  Treating the whole event as
failed would not work in this case.  Thinking again, the code only existed
when any CPU-level aggregation is enabled (like per-socket, per-core, ...).

To make it clearer, factor out the condition check into the new
evsel__count_has_error() function and add some comments.

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Athira Jajeev <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Xing Zhengjun <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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