Merge branch 'mptcp-misc-fixes-for-v6-18-rc7'

Matthieu Baerts says:

====================
mptcp: misc fixes for v6.18-rc7

Here are various unrelated fixes:

- Patch 1: Fix window space computation for fallback connections which
  can affect ACK generation. A fix for v5.11.

- Patch 2: Avoid unneeded subflow-level drops due to unsynced received
  window. A fix for v5.11.

- Patch 3: Avoid premature close for fallback connections with PREEMPT
  kernels. A fix for v5.12.

- Patch 4: Reset instead of fallback in case of data in the MPTCP
  out-of-order queue. A fix for v5.7.

- Patches 5-7: Avoid also sending "plain" TCP reset when closing with an
  MP_FASTCLOSE. A fix for v6.1.

- Patches 8-9: Longer timeout for background connections in MPTCP Join
  selftests. An additional fix for recent patches for v5.13/v6.1.

- Patches 10-11: Fix typo in a check introduce in a recent refactoring.
  A fix for v6.15.
====================

Link: https://patch.msgid.link/20251118-net-mptcp-misc-fixes-6-18-rc6-v1-0-806d3781c95f@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>