apparmor: add missing id bounds check on dfa verification

commit 15756178c6a65b261a080e21af4766f59cafc112 upstream.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Corey Edwards <ensabahnur16@gmail.com>