batman-adv: v: prevent OGM aggregation on disabled hardif

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CVE-2026-64094: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid NULL-ptr deref for claim via dropped interface Without rtnllock held, a hardif might be retrieved as primary interface of a meshif, but then while operating on this interface getting decoupled from the mesh...