CVE-2025-40339

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: fix nullptr err of vm_handle_moved

If a amdgpu_bo_va is fpriv->prt_va, the bo of this one is always NULL.
So, such kind of amdgpu_bo_va should be updated separately before
amdgpu_vm_handle_moved.