[PATCH -next] perf tests: Fix an incorrect type in append_script()

[Jiapeng Chong <jiapeng.chong@linux.alibaba.com>]

The return value from the call to readlink() is ssize_t. However, the
return value is being assigned to an size_t variable 'len', so making
'len' an ssize_t.

./tools/perf/tests/tests-scripts.c:182:5-8: WARNING: Unsigned expression compared with zero: len < 0.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=11909
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 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);
-- 
2.32.0.3.g01195cf9f