null_blk: free global tag_set on init error path

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/block/null_blk/main.c"
                    ],
                    "versions": [
                        {
                            "version": "82f402fefa50f1675bf918bcd009981bd6b30ac8",
                            "lessThan": "0b2faa330184340d9418ad2c627c2ae881772e33",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "82f402fefa50f1675bf918bcd009981bd6b30ac8",
                            "lessThan": "665c94554ff0d5d88caae7f40c16c8e0a3369eda",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "82f402fefa50f1675bf918bcd009981bd6b30ac8",
                            "lessThan": "2882e1450fa4597811a951196e07553ea134eb31",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "82f402fefa50f1675bf918bcd009981bd6b30ac8",
                            "lessThan": "2b59484ac1e64dd78dbe8c6140891c6308085a75",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "82f402fefa50f1675bf918bcd009981bd6b30ac8",
                            "lessThan": "081cf37e8a0e00cd91d6df53172c9d928790a798",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "82f402fefa50f1675bf918bcd009981bd6b30ac8",
                            "lessThan": "5a1c5ff3a49ba93a1fd0b70537e7a0164071760d",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/block/null_blk/main.c"
                    ],
                    "versions": [
                        {
                            "version": "4.13",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.13",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }