teach clang analyser that _assert_int_equal and _assert_int_not_equal don't return on failure
lib/dns/test/rdata_test.c had a false positive null pointer dereference: https://jenkins.isc.org/view/BIND/job/bind9-clang-static-analyzer/372/clangScanBuildBugs/browse/report-9e0ad0.html#EndPath
clang test with this fix: https://jenkins.isc.org/view/BIND_Parameterized/job/bind9-parameterized-clang-static-analyzer/142/console