Merge branch 'mptcp-sched-fix-some-lock-issues'

Matthieu Baerts says:

====================
mptcp: sched: fix some lock issues

Two small fixes related to the MPTCP packets scheduler:

- Patch 1: add missing rcu_read_(un)lock(). A fix for >= 6.6.

And some modifications in the MPTCP selftests:

- Patch 2: a small addition to the MPTCP selftests to cover more code.
====================

Link: https://patch.msgid.link/20241021-net-mptcp-sched-lock-v1-0-637759cf061c@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>