Set (instead of compare) exresult

Christian Boltzrequested to merge
cboltz/apparmor:cboltz-compare-exresult into master

Interestingly this accidentally worked because if exresult is true for both a non-empty string ("PASS") as well as a real True value.

Found by Mark Grassi as part of !906 (merged)

I propose this patch for all branches.

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