NFSD: fix race between nfsd registration and exports_proc

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

CVE-2025-38232 · Microsoft / collected KEV context

cve-program · CVE-2025-38232

• https://git.kernel.org/stable/c/49b57b98fa601ae6cc7897bab4515129da8290f7
• https://git.kernel.org/stable/c/88d6785c173a7c4de05bef8c4fd8a9b42ead02d5
• https://git.kernel.org/stable/c/8120e420013d947c890f358f30a2d98ba8ac20bc
• https://git.kernel.org/stable/c/2029ca75cdfa6a25716a5a76b751486cce7e3822
• https://git.kernel.org/stable/c/327011a2bb4f7de9c72b891a96ce8d902828bddf
• https://git.kernel.org/stable/c/f7fb730cac9aafda8b9813b55d04e28a9664d17c

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