krb5: fix kadmind denial of service via null pointer dereference (CVE-2012-1013)

Fixing CVE-2012-1013 (krb5 kadmind denial of service via null pointer dereference)

Fixed bugs
bnc#765485
VUL-1: CVE-2012-1013: krb5: kadmind denial of service via null pointer dereference
Selected Binaries
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