btrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()

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                        "fs/btrfs/extent-tree.c"
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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/extent-tree.c"
                    ],
                    "versions": [
                        {
                            "version": "4.20",
                            "status": "affected"
                        },
                        {
                            "version": "0",
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                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.261",
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                        },
                        {
                            "version": "5.15.212",
                            "lessThanOrEqual": "5.15.*",
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                            "version": "6.1.178",
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                            "version": "6.18.40",
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                            "version": "7.1.5",
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                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }