[PATCH bpf] selftests/bpf: wq: fix skel leak in serial_test_wq()

[Kery Qi]

When wq__attach() fails, serial_test_wq() returns early without calling
wq__destroy(), leaking the skeleton resources allocated by
wq__open_and_load().

Fix this by jumping to a common clean_up label that calls wq__destroy()
on all exit paths after successful open_and_load.

Fixes: 8290dba51910 ("selftests/bpf: wq: add bpf_wq_start() checks")
Signed-off-by: Kery Qi <qikeyu2...@gmail.com>
---
 tools/testing/selftests/bpf/prog_tests/wq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/wq.c 
b/tools/testing/selftests/bpf/prog_tests/wq.c
index 1dcdeda84853..b32e22876492 100644
--- a/tools/testing/selftests/bpf/prog_tests/wq.c
+++ b/tools/testing/selftests/bpf/prog_tests/wq.c
@@ -17,11 +17,11 @@ void serial_test_wq(void)
 
        wq_skel = wq__open_and_load();
        if (!ASSERT_OK_PTR(wq_skel, "wq_skel_load"))
-               return;
+               goto clean_up;
 
        err = wq__attach(wq_skel);
        if (!ASSERT_OK(err, "wq_attach"))
-               goto clean_up
+               goto clean_up;
 
        prog_fd = bpf_program__fd(wq_skel->progs.test_syscall_array_sleepable);
        err = bpf_prog_test_run_opts(prog_fd, &topts);
-- 
2.34.1