AZL-34797 CVE-2022-45142 affecting package heimdal for versions less than 7.8.0-3

The fix for CVE-2022-3437 included changing memcmp to be constant time and a workaround for a compiler bug by adding "!= 0" comparisons to the result of memcmp. When these patches were backported to the heimdal-7.7.1 and heimdal-7.8.0 branches and possibly other branches a logic inversion sneaked...