CVE-2026-68298 drm/xe/vm: Fix SVM leak on resv obj alloc failure in xe_vm_create()

In the Linux kernel, the following vulnerability has been resolved: drm/xe/vm: Fix SVM leak on resv obj alloc failure in xevmcreate Commit 9e9787414882 "drm/xe/userptr: replace xehmm with gpusvm" made xesvminit unconditional in xevmcreate and extended it to also initialize a "simple" gpusvm state...