aa_get_newest_cred_label
label = aa_get_newest_cred_label(subj_cred);
struct aa_label *label = aa_get_newest_cred_label(cred);
tl = aa_get_newest_cred_label(tc);
cl = aa_get_newest_cred_label(cred);
label = aa_get_newest_cred_label(cred);
label = aa_get_newest_cred_label(cred);
peer = aa_get_newest_cred_label(__task_cred(task));
p = aa_get_newest_cred_label(__task_cred(task));