perf stat: Use recently introduced skip_spaces()

No change in behaviour.

Cc: Andi Kleen <ak@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-ncpvp4eelf8fqhuy29uv56z9@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/stat-display.c

 #include <stdio.h>
 #include <inttypes.h>
+#include <linux/string.h>
 #include <linux/time64.h>
 #include <math.h>
 #include "color.h"
@@ -215,9 +216,7 @@ static void print_metric_csv(struct perf_stat_config *config __maybe_unused,
 	while (isdigit(*ends) || *ends == '.')
 		ends++;
 	*ends = 0;
-	while (isspace(*unit))
-		unit++;
-	fprintf(out, "%s%s%s%s", config->csv_sep, vals, config->csv_sep, unit);
+	fprintf(out, "%s%s%s%s", config->csv_sep, vals, config->csv_sep, skip_spaces(unit));
 }
 
 /* Filter out some columns that don't work well in metrics only mode */