CVE-2025-40339 drm/amdgpu: fix nullptr err of vm_handle_moved

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Multiple CVEs Identified in AMD GPU Driver Vulnerabilities Two vulnerabilities in the AMD GPU driver have been reported, identified as CVE-2024-42228 and CVE-2024-56551. CVE-2024-42228 involves the use of an uninitialized value in the amdgpu_vce_cs_reloc function, while CVE-2024-56551 addresses a slab usage after free issue. Both vulnerabilities affect systems utilizing the AMD GPU driver. 14 sources 39