gfs2: Fix potential glock use-after-free on unmount

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/gfs2/glock.c",
                        "fs/gfs2/glock.h",
                        "fs/gfs2/incore.h",
                        "fs/gfs2/lock_dlm.c",
                        "fs/gfs2/ops_fstype.c",
                        "fs/gfs2/super.c"
                    ],
                    "versions": [
                        {
                            "version": "fb6791d100d1bba20b5cdbc4912e1f7086ec60f8",
                            "lessThan": "0636b34b44589b142700ac137b5f69802cfe2e37",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fb6791d100d1bba20b5cdbc4912e1f7086ec60f8",
                            "lessThan": "e42e8a24d7f02d28763d16ca7ec5fc6d1f142af0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fb6791d100d1bba20b5cdbc4912e1f7086ec60f8",
                            "lessThan": "501cd8fabf621d10bd4893e37f6ce6c20523c8ca",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fb6791d100d1bba20b5cdbc4912e1f7086ec60f8",
                            "lessThan": "d98779e687726d8f8860f1c54b5687eec5f63a73",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/gfs2/glock.c",
                        "fs/gfs2/glock.h",
                        "fs/gfs2/incore.h",
                        "fs/gfs2/lock_dlm.c",
                        "fs/gfs2/ops_fstype.c",
                        "fs/gfs2/super.c"
                    ],
                    "versions": [
                        {
                            "version": "3.8",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.8",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.33",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.8.12",
                            "lessThanOrEqual": "6.8.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.9.3",
                            "lessThanOrEqual": "6.9.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.10",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }