checkpolicy: dis* fixed signed vs unsigned errors

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This patch looks good to me. acked.

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iEYEARECAAYFAk7dG8oACgkQrlYvE4MpobMMQgCgmAarqPUYaCsnuKbz7q/Gv1j/ OwUAoOsSdeMCa0vhqBbT/gfzz17aQUai
=Bqzc
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