ieee802154: 6lowpan: fix NULL dereference in lowpan_newlink

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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "net/ieee802154/6lowpan/core.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": [
                        "net/ieee802154/6lowpan/core.c"
                    ],
                    "versions": [
                        {
                            "version": "4.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.3",
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                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
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                        },
                        {
                            "version": "6.6.158",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
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                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
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                            "versionType": "semver"
                        },
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                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
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                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }