perf stat: Split print_noise_pct() function

Likewise, split print_noise_pct() for each output mode.  Although it's
a tiny function, more logic will be added soon so it'd be better split
it and treat it in the same way.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221114230227.1255976-4-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/stat-display.c

@@ -62,17 +62,36 @@ static void print_running(struct perf_stat_config *config,
 		print_running_std(config, run, ena);
 }
 
+static void print_noise_pct_std(struct perf_stat_config *config,
+				double pct)
+{
+	if (pct)
+		fprintf(config->output, "  ( +-%6.2f%% )", pct);
+}
+
+static void print_noise_pct_csv(struct perf_stat_config *config,
+				double pct)
+{
+	fprintf(config->output, "%s%.2f%%", config->csv_sep, pct);
+}
+
+static void print_noise_pct_json(struct perf_stat_config *config,
+				 double pct)
+{
+	fprintf(config->output, "\"variance\" : %.2f, ", pct);
+}
+
 static void print_noise_pct(struct perf_stat_config *config,
 			    double total, double avg)
 {
 	double pct = rel_stddev_stats(total, avg);
 
 	if (config->json_output)
-		fprintf(config->output, "\"variance\" : %.2f, ", pct);
+		print_noise_pct_json(config, pct);
 	else if (config->csv_output)
-		fprintf(config->output, "%s%.2f%%", config->csv_sep, pct);
-	else if (pct)
-		fprintf(config->output, "  ( +-%6.2f%% )", pct);
+		print_noise_pct_csv(config, pct);
+	else
+		print_noise_pct_std(config, pct);
 }
 
 static void print_noise(struct perf_stat_config *config,