Merge branch 'mptcp-misc-fixes-for-v7-1-rc3'

Matthieu Baerts says:

====================
mptcp: misc fixes for v7.1-rc3

Here are various unrelated fixes:

- Patch 1: increment the right MIB counter. A fix for v5.7.

- Patch 2: set the right MPTCP reset reason. A fix for v5.9.

- Patch 3: fix rx timestamp corruption when on MPTCP passive fastopen. A
  fix for v6.2.

- Patch 4: increase sockopt seq after having set TCP_MAXSEG to propagate
  it to newer subflows later. A fix for 6.17.
====================

Link: https://patch.msgid.link/20260501-net-mptcp-misc-fixes-7-1-rc3-v1-0-b70118df778e@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>