bpf: Fix potential UAF in bpf_netns_link_update_prog

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{
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/net_namespace.c"
                    ],
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                            "status": "affected"
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                            "version": "0",
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                            "version": "5.15.221",
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                            "versionType": "original_commit_for_fix"
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                }