libselinux: fix python audit2why binding error

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This patch looks good to me. acked.
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iEYEARECAAYFAk45tG4ACgkQrlYvE4MpobOaHgCgiIhmd1Hv77+ZEDSEI64GJpt+ nEkAn2CmxSdP8uoKv3lCu7ck7xvQ/Lue
=ghmO
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