CVE-2024-46773 drm/amd/display: Check denominator pbn_div before used

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Multiple CVEs Identified in AMD Display Driver Vulnerabilities Two vulnerabilities in the AMD display driver have been identified, designated as CVE-2024-46772 and CVE-2024-46773. Both vulnerabilities were published on September 18, 2024, and involve checks on denominators that could lead to potential exploitation. Affected systems include those utilizing the AMD display driver. 2 sources 45