Commit 5198107bca for frr

commit 5198107bca0b05baa6eb11968076fe002c006d4d
Merge: 0ba2e70757 d19d9b286d
Author: Russ White <russ@riw.us>
Date:   Tue Oct 27 11:47:14 2026 -0400

    Merge pull request #23745 from mhchann/isisd-flex-algo-null-subtlvs-23693-fix

    isisd: fix flex-algo SPF crash on a link without sub-TLVs