Avoid two static paths that contributed 8,192 bytes to .bss are only
used duing the perf parse pmu test. This change helps FORTIFY
triggering 2 warnings like:

```
tests/pmu.c: In function ‘test__pmu’:
tests/pmu.c:121:43: error: ‘%s’ directive output may be truncated writing up to 4095 bytes into a region of size 4090 [-Werror=format-truncation=]
  121 |         snprintf(buf, sizeof(buf), "rm -f %s/*\n", dir);
```

So make buf a little larger.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/pmu.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/tools/perf/tests/pmu.c b/tools/perf/tests/pmu.c
index 3cf25f883df7..a4452639a3d4 100644
--- a/tools/perf/tests/pmu.c
+++ b/tools/perf/tests/pmu.c
@@ -86,17 +86,16 @@ static struct parse_events_term test_terms[] = {
  * Prepare format directory data, exported by kernel
  * at /sys/bus/event_source/devices/<dev>/format.
  */
-static char *test_format_dir_get(void)
+static char *test_format_dir_get(char *dir, size_t sz)
 {
-	static char dir[PATH_MAX];
 	unsigned int i;
 
-	snprintf(dir, PATH_MAX, "/tmp/perf-pmu-test-format-XXXXXX");
+	snprintf(dir, sz, "/tmp/perf-pmu-test-format-XXXXXX");
 	if (!mkdtemp(dir))
 		return NULL;
 
 	for (i = 0; i < ARRAY_SIZE(test_formats); i++) {
-		static char name[PATH_MAX];
+		char name[PATH_MAX];
 		struct test_format *format = &test_formats[i];
 		FILE *file;
 
@@ -118,12 +117,13 @@ static char *test_format_dir_get(void)
 /* Cleanup format directory. */
 static int test_format_dir_put(char *dir)
 {
-	char buf[PATH_MAX];
-	snprintf(buf, PATH_MAX, "rm -f %s/*\n", dir);
+	char buf[PATH_MAX + 20];
+
+	snprintf(buf, sizeof(buf), "rm -f %s/*\n", dir);
 	if (system(buf))
 		return -1;
 
-	snprintf(buf, PATH_MAX, "rmdir %s\n", dir);
+	snprintf(buf, sizeof(buf), "rmdir %s\n", dir);
 	return system(buf);
 }
 
@@ -140,7 +140,8 @@ static struct list_head *test_terms_list(void)
 
 static int test__pmu(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 {
-	char *format = test_format_dir_get();
+	char dir[PATH_MAX];
+	char *format = test_format_dir_get(dir, sizeof(dir));
 	LIST_HEAD(formats);
 	struct list_head *terms = test_terms_list();
 	int ret;
-- 
2.41.0.rc0.172.g3f132b7071-goog