apparmor: reduce rcu_read_lock scope for aa_file_perm mediation
Now that the buffers allocation has changed and no longer needs the full mediation under an rcu_read_lock, reduce the rcu_read_lock scope to only where it is necessary. Fixes: df323337 ("apparmor: Use a memory pool instead per-CPU caches") Signed-off-by:John Johansen <john.johansen@canonical.com>
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