wifi: brcmfmac: make release_scratchbuffers idempotent

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

CVE-2026-68192 · Microsoft / collected KEV context

cve-program · CVE-2026-68192

• https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38
• https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f
• https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22
• https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a
• https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0
• https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5
• https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6
• https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d

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