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2017-01-16apparmor: add a default null dfaJohn Johansen
Instead of testing whether a given dfa exists in every code path, have a default null dfa that is used when loaded policy doesn't provide a dfa. This will let us get rid of special casing and avoid dereference bugs when special casing is missed. Signed-off-by: John Johansen <john.johansen@canonical.com>