perf stat: Don't call perf_stat_evsel_id_init() repeatedly

evsel__reset_stat_priv() is called more than once if user gave -r option
for multiple runs.  But it doesn't need to re-initialize the id.
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20220930202110.845199-3-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/stat.c

@@ -135,7 +135,6 @@ static void evsel__reset_stat_priv(struct evsel *evsel)
 	struct perf_stat_evsel *ps = evsel->stats;
 
 	init_stats(&ps->res_stats);
-	perf_stat_evsel_id_init(evsel);
 }
 
 static int evsel__alloc_stat_priv(struct evsel *evsel)
@@ -143,6 +142,7 @@ static int evsel__alloc_stat_priv(struct evsel *evsel)
 	evsel->stats = zalloc(sizeof(struct perf_stat_evsel));
 	if (evsel->stats == NULL)
 		return -ENOMEM;
+	perf_stat_evsel_id_init(evsel);
 	evsel__reset_stat_priv(evsel);
 	return 0;
 }