ipv6/addrconf: fix a potential refcount underflow for idev

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2023-53189 · Microsoft / collected KEV context

cve-program · CVE-2023-53189

• https://git.kernel.org/stable/c/c6395e32935d35e6f935e7caf1c2dac5a95943b4
• https://git.kernel.org/stable/c/df62fdcd004afa72ecbed0e862ebb983acd3aa57
• https://git.kernel.org/stable/c/c7eeba47058532f6077d6a658e38b6698f6ae71a
• https://git.kernel.org/stable/c/2ad31ce40e8182860b631e37209e93e543790b7c
• https://git.kernel.org/stable/c/82abd1c37d3bf2a2658b34772c17a25a6f9cca42
• https://git.kernel.org/stable/c/436b7cc7eae7851c184b671ed7a4a64c750b86f7
• https://git.kernel.org/stable/c/1f656e483eb4733d62f18dfb206a49b78f60f495
• https://git.kernel.org/stable/c/06a0716949c22e2aefb648526580671197151acc

No related operational record is retained in the current change model.