mptcp: use the workqueue to destroy unaccepted sockets

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/mptcp/protocol.c",
                        "net/mptcp/protocol.h",
                        "net/mptcp/subflow.c"
                    ],
                    "versions": [
                        {
                            "version": "58b09919626bf9067345289212ec030c61eb1034",
                            "lessThan": "2827f099b3fb9a59263c997400e9182f5d423e84",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "58b09919626bf9067345289212ec030c61eb1034",
                            "lessThan": "804cf487fb0031f3c74755b78d8663333f0ba636",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "58b09919626bf9067345289212ec030c61eb1034",
                            "lessThan": "b6985b9b82954caa53f862d6059d06c0526254f0",
                            "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/mptcp/protocol.c",
                        "net/mptcp/protocol.h",
                        "net/mptcp/subflow.c"
                    ],
                    "versions": [
                        {
                            "version": "5.7",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.7",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.22",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.2.8",
                            "lessThanOrEqual": "6.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }