checkpolicy: dis* fixed signed vs unsigned errors

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This patch looks good to me. acked.

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iEYEARECAAYFAk60AVMACgkQrlYvE4MpobNRHACeJ7YIbSg3nymdgaJpMk2y3vk6 u7wAnivsutaWlpmDLNyUFoMGZ7Mcork1
=ai25
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