ksmbd: fix uaf in smb20_oplock_break_ack

LLM-synthesized narrative grounded in this CVE's description and references.

• Linux/Ksmbdllm-fuzzy
• Linux/Kernelcpe-rescue

  Range: 5.15

• git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fdmitre
• git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930mitre
• git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afcemitre
• git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9mitre

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