Merge branch 'mptcp-pm-defer-freeing-userspace-pm-entries'

Matthieu Baerts says:

====================
mptcp: pm: Defer freeing userspace pm entries

Here are two unrelated fixes for MPTCP:

- Patch 1: free userspace PM entry with RCU helpers. A fix for v6.14.

- Patch 2: avoid a warning when running diag.sh selftest. A fix for
  v6.15-rc1.
====================

Link: https://patch.msgid.link/20250421-net-mptcp-pm-defer-freeing-v1-0-e731dc6e86b9@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>