CVE-2023-53786 dm flakey: fix a crash with invalid table line

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/dm-flakey.c"
    ],
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/dm-flakey.c"
    ],
    "versions": [
      {
        "version": "3.1",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "3.1",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "4.14.315",
        "lessThanOrEqual": "4.14.*",
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      },
      {
        "version": "4.19.283",
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        "version": "5.4.243",
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      },
      {
        "version": "5.10.180",
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      {
        "version": "5.15.111",
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      {
        "version": "6.1.28",
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      {
        "version": "6.2.15",
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      {
        "version": "6.3.2",
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      {
        "version": "6.4",
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    ]
  }
]