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

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "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"
                    ],
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{
                    "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"
                    ],
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                            "version": "6.1.191",
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                        {
                            "version": "6.6.33",
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                        },
                        {
                            "version": "6.8.12",
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