[RFT PATCH v2 1/7] perf stat: Check color's length instead of the pointer

[Yushan Wang <wangyushan12@huawei.com>]

Color string returned by metric_threshold_classify__color() is never
NULL, check the presence of *color will always return true.

Fix this by change the checks against length of *color.

Fixes: 37b77ae95416 ("perf stat: Change color to threshold in print_metric")
Signed-off-by: Yushan Wang <wangyushan12@huawei.com>
---
 tools/perf/builtin-script.c    | 2 +-
 tools/perf/util/stat-display.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index c8ac9f01a36b..58cd5cd377a6 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -2111,7 +2111,7 @@ static void script_print_metric(struct perf_stat_config *config __maybe_unused,
 	perf_sample__fprintf_start(NULL, mctx->sample, mctx->thread, mctx->evsel,
 				   PERF_RECORD_SAMPLE, mctx->fp);
 	fputs("\tmetric: ", mctx->fp);
-	if (color)
+	if (strlen(color))
 		color_fprintf(mctx->fp, color, fmt, val);
 	else
 		printf(fmt, val);
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 993f4c4b8f44..74cba80c24b0 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -474,7 +474,7 @@ static void print_metric_std(struct perf_stat_config *config,
 		do_new_line_std(config, os);
 
 	n = fprintf(out, " # ");
-	if (color)
+	if (strlen(color))
 		n += color_fprintf(out, color, fmt, val);
 	else
 		n += fprintf(out, fmt, val);
@@ -607,7 +607,7 @@ static void print_metric_only(struct perf_stat_config *config,
 	if (mlen < strlen(unit))
 		mlen = strlen(unit) + 1;
 
-	if (color)
+	if (strlen(color))
 		mlen += strlen(color) + sizeof(PERF_COLOR_RESET) - 1;
 
 	color_snprintf(str, sizeof(str), color ?: "", fmt ?: "", val);
-- 
2.33.0