drm/gma500: Fix null dereference in hdmi teardown_MS:CVE-2025-40011

{
    "lastseen": "2025-10-22T22:55:07",
    "description": "",
    "published": "2025-10-22T01:01:36",
    "modified": "2025-10-22T01:01:36",
    "type": "mscve",
    "title": "drm/gma500: Fix null dereference in hdmi teardown",
    "source": "",
    "references": "",
    "id": "MS:CVE-2025-40011",
    "bulletinFamily": "microsoft",
    "cwe": null,
    "cvelist": [
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    },
    "href": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-40011",
    "category_name": "News",
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