Merge branch 'tcp-take-better-care-of-tw_substate-and-tw_rcv_nxt'

Eric Dumazet says:

====================
tcp: take better care of tw_substate and tw_rcv_nxt

While reviewing Jason Xing recent commit (0d9e5df4a257 "tcp: avoid reusing
FIN_WAIT2 when trying to find port in connect() process") I saw
we could remove the volatile qualifier for tw_substate field,
and I also added missing data-race annotations around tcptw->tw_rcv_nxt.
====================

Link: https://patch.msgid.link/20240827015250.3509197-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>