Merge branch 'tcp-__tcp_close-changes'

Eric Dumazet says:

====================
tcp: __tcp_close() changes

First patch fixes a rare bug.

Second patch adds a corresponding packetdrill test.

Third patch is a small optimization.
====================

Link: https://patch.msgid.link/20250903084720.1168904-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>