tipc: fix NULL deref in tipc_named_node_up() on empty publication list

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/tipc/name_table.c"
                    ],
                    "versions": [
                        {
                            "version": "a5e7ac5ce134d8f72f59631011fafa7bbf7ca174",
                            "lessThan": "246a4b4aace490664927042e93400a6f940d197f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a5e7ac5ce134d8f72f59631011fafa7bbf7ca174",
                            "lessThan": "6188cf0c989dea60f2efe800eaebb7d0bd16e2b2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a5e7ac5ce134d8f72f59631011fafa7bbf7ca174",
                            "lessThan": "b5344e459996afb45e30fdc407b41e6674793b21",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a5e7ac5ce134d8f72f59631011fafa7bbf7ca174",
                            "lessThan": "68619f965329d2f7b113a3d5811aa23198f39105",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a5e7ac5ce134d8f72f59631011fafa7bbf7ca174",
                            "lessThan": "ad805326d874062f8bc72a94884f86046148cde3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a5e7ac5ce134d8f72f59631011fafa7bbf7ca174",
                            "lessThan": "d0d82f1214f321143c5dbc2e48e4a4e6c4226895",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a5e7ac5ce134d8f72f59631011fafa7bbf7ca174",
                            "lessThan": "b3b76e9f4f2476f1135b2ba7743a821db4a0df4b",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/tipc/name_table.c"
                    ],
                    "versions": [
                        {
                            "version": "3.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }