null_blk: serialize configfs attribute stores with the lock

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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/block/null_blk/main.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": [
                        "drivers/block/null_blk/main.c"
                    ],
                    "versions": [
                        {
                            "version": "5.5",
                            "status": "affected"
                        },
                        {
                            "version": "0",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
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                            "status": "unaffected",
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                        },
                        {
                            "version": "6.6.157",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
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                            "version": "7.3",
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                            "versionType": "original_commit_for_fix"
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                    ]
                }