apparmor: fix race condition in null profile creation

apparmor: fix race condition in null profile creation

There is a race when null- profile is being created between the
initial lookup/creation of the profile and lock/addition of the
profile. This could result in multiple version of a profile being
added to the list which need to be removed/replaced.

Since these are learning profile their is no affect on mediation.

Signed-off-by: John Johansen <john.johansen@canonical.com>
(cherry picked from commit 3aa3de2a4fb8f33ec62b00998bc6b6c6850d41b1 linux-next)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>