Merge branch 'selftests-tc-testing-more-tdc-updates'

Pedro Tammela says:

====================
selftests: tc-testing: more tdc updates

Follow-up on a feedback from Jakub and random cleanups from related
net/sched patches
====================

Link: https://lore.kernel.org/r/20231129222424.910148-1-pctammela@mojatatu.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>