net/sched: remove qdisc_root_lock() helper
the last caller has been removed with commit 96f5e66e ("mac80211: fix aggregation for hardware with ampdu queues"), so it's safe to remove this function. Signed-off-by: Davide Caratti <dcaratti@redhat.com> Link: https://lore.kernel.org/r/703d549e3088367651d92a059743f1be848d74b7.1658133689.git.dcaratti@redhat.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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