test_kretprobe
ret = test_kretprobe(func);
KUNIT_CASE(test_kretprobe),
prog_fd = bpf_program__fd(skel->progs.test_kretprobe);
link2 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kretprobe,
prog_fd = bpf_program__fd(skel->progs.test_kretprobe);
int test_kretprobe(struct pt_regs *ctx)