sched/deadline: Fix task_struct reference leak

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/sched/deadline.c"
                    ],
                    "versions": [
                        {
                            "version": "feff2e65efd8d84cf831668e182b2ce73c604bbb",
                            "lessThan": "f8005214946fd1d9fefdeff19c6ce46d60de2cef",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "feff2e65efd8d84cf831668e182b2ce73c604bbb",
                            "lessThan": "7a54d31face626f62de415ebe77b43f76c3ffaf4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "feff2e65efd8d84cf831668e182b2ce73c604bbb",
                            "lessThan": "b58652db66c910c2245f5bee7deca41c12d707b9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f0e1c1d8ff908a39dd42e723d08f104505dfa601",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "184c8ab5342450c4ae6fc5d937f9bb06c620dcf1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4.19.257",
                            "lessThan": "4.20",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.212",
                            "lessThan": "5.5",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/sched/deadline.c"
                    ],
                    "versions": [
                        {
                            "version": "5.10",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.10",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.9.10",
                            "lessThanOrEqual": "6.9.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.10",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }