Commit 622c8322d2 for frr

commit 622c8322d29398483a94ce6a555ebdff819ccc64
Merge: a19ece1b3b eaaf4e5d4b
Author: Russ White <russ@riw.us>
Date:   Thu Nov 12 11:39:55 2026 -0500

    Merge pull request #24262 from w453y/bfdd-client-dereg-state

    bfdd: keep a session's state when a client leaves it