message: Add return statement to the micro-test framework.
  Return kTfLiteOk/kTfLiteError depending on if the test succeeded or not.
diff: @@ -85,8 +85,10 @@ extern tflite::ErrorReporter* reporter;
  (micro_test::tests_failed + micro_test::tests_passed)); \
  if (micro_test::tests_failed == 0) { \
  micro_test::reporter->Report("~~~ALL TESTS PASSED~~~\n"); \
  + return kTfLiteOk; \
  } else { \
  micro_test::reporter->Report("~~~SOME TESTS FAILED~~~\n"); \
  + return kTfLiteError; \
  } \
  }
  