tls: improve debugging assertion
Refs: https://github.com/nodejs/node/issues/22618
Checklist
-
make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Refs: https://github.com/nodejs/node/issues/22618
make -j4 test (UNIX), or vcbuild test (Windows) passes