Merge branch 'net_sched-prevent-creation-of-classes-with-tc_h_root'

Cong Wang says:

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net_sched: Prevent creation of classes with TC_H_ROOT

This patchset contains a bug fix and its TDC test case.
====================

Link: https://patch.msgid.link/20250306232355.93864-1-xiyou.wangcong@gmail.com


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