CVE-2024-26939 drm/i915/vma: Fix UAF on destroy against retire race

In the Linux kernel, the following vulnerability has been resolved: drm/i915/vma: Fix UAF on destroy against retire race Object debugging tools were sporadically reporting illegal attempts to free a still active i915 VMA object when parking a GT believed to be idle. 161.359441 ODEBUG: free active...