The label struct is variable length. While its use in struct aa_profile
is fixed length at 2 entries the variable length member needs to be
the last member in the structure.
The code already does this but the comment has it in the wrong location.
Also add a comment to ensure it stays at the end of the structure.
While we are at it, update the documentation for other profile members
as well.
Signed-off-by: John Johansen <john.johansen@canonical.com>
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