CVE-2026-72459: apparmor: aa_label_alloc use aa_label_free on alloc failure

In the Linux kernel, the following vulnerability has been resolved:

apparmor: aalabelalloc use aalabelfree on alloc failure

aalabelalloc() allocates a secid before allocating or taking the label proxy. If the later proxy step fails, the error path only freed the label memory, leaking any resources initialized by aalabelinit().

Use aalabelfree() on the failure path so partially initialized labels release their secid and other label resources before the backing memory is freed.