Cmocka tests with sanitizer errors still pass

[PJK]

E.g.

23: Test command: /tmp/build.Hz5D/test/type_7_encoders_test
23: Test timeout computed to be: 1500
23: [==========] Running 8 test(s).
23: [ RUN      ] test_bools
23: [       OK ] test_bools
23: [ RUN      ] test_null
23: [       OK ] test_null
23: [ RUN      ] test_undef
23: [       OK ] test_undef
23: [ RUN      ] test_break
23: [       OK ] test_break
23: [ RUN      ] test_half
23: [       OK ] test_half
23: [ RUN      ] test_float
23: [       OK ] test_float
23: [ RUN      ] test_double
23: [...]: runtime error: store to misaligned address 0x0001074d00c1 for type 'uint64_t' (aka 'unsigned long long'), which requires 8 byte alignment
23: 0x0001074d00c1: note: pointer points here
23:  00 00 00  fb 7f 7f ff ff 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00
23:               ^
23: SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior [...]
23: [       OK ] test_double
23: [ RUN      ] test_half_special
23: [       OK ] test_half_special
23: [==========] 8 test(s) run.
23: [  PASSED  ] 8 test(s).
23/25 Test #23: type_7_encoders_test .............   Passed    0.02 sec