CVE-2023-52696 powerpc/powernv: Add a null pointer check in opal_powercap_init()

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/powerpc/platforms/powernv/opal-powercap.c"
    ],
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  },
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    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/powerpc/platforms/powernv/opal-powercap.c"
    ],
    "versions": [
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        "version": "4.20",
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      },
      {
        "version": "0",
        "lessThan": "4.20",
        "status": "unaffected",
        "versionType": "semver"
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      {
        "version": "5.4.268",
        "lessThanOrEqual": "5.4.*",
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      },
      {
        "version": "5.10.209",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
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      },
      {
        "version": "5.15.148",
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      },
      {
        "version": "6.1.75",
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      },
      {
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      {
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      {
        "version": "6.8",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]