[apparmor] [PATCH] cleanup followpos

[John Johansen]

When creating the dfa the sets firstpos, lastpos, and followpos are computed for
each expression tree node and then used as input to create the dfa states.

Currently they are not being freed until the nodes are destroyed, but the information
is no longer needed once the dfa has been created.  Cleaning them up early reduces
peak memory usage.
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