[PATCH v1] perf tests: Fix unsigned comparison with less than zero

[guanjing]

The return value from the call to readlink() is not unsigned.
However, the return value is being assigned to an size_t
variable 'len', so making 'len' an ssize_t.

Eliminate the following coccicheck warning:

tools/perf/tests/tests-scripts.c:181:5-8: WARNING:
Unsigned expression compared with zero: len < 0

Fixes: 964461ee370f ("perf tests: Run time generate shell test suites")
Signed-off-by: guanjing <guanjing@xxxxxxxxxxxxxxxxxxxx>
---
 tools/perf/tests/tests-scripts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/tests-scripts.c b/tools/perf/tests/tests-scripts.c
index cf3ae0c1d871..1d5759d08141 100644
--- a/tools/perf/tests/tests-scripts.c
+++ b/tools/perf/tests/tests-scripts.c
@@ -174,7 +174,7 @@ static void append_script(int dir_fd, const char *name, char *desc,
 	char filename[PATH_MAX], link[128];
 	struct test_suite *test_suite, **result_tmp;
 	struct test_case *tests;
-	size_t len;
+	ssize_t len;
 	char *exclusive;
 
 	snprintf(link, sizeof(link), "/proc/%d/fd/%d", getpid(), dir_fd);
-- 
2.33.0