drm/amdgpu: fix calltrace warning in amddrm_buddy_fini

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CVE-2023-53152

CVE-2023-53152 concerns the Linux kernel AMDGPU driver. The issue arises during removal of the amdgpu driver where BOs allocated for PSP are not freed, triggering a calltrace warning in amddrm_buddy_fini and related shutdown paths (amdgpu_exit, amdgpu_driver_release_kms). The provided trace shows...