fix: frr building problem

[grubwithu]

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grubwithu is a new contributor to projects/frr. The PR must be approved by known contributors before it can be merged. The past contributors are: qlyoung, catenacyber

[oliverchang]

Thanks! Can you fix the ubsan error (https://github.com/google/oss-fuzz/actions/runs/15633167534/job/44081500611?pr=13434), or alternatively disable ubsan?