CVE-2025-40360 drm/sysfb: Do not dereference NULL pointer in plane reset

In the Linux kernel, the following vulnerability has been resolved: drm/sysfb: Do not dereference NULL pointer in plane reset The plane state in drmgemresetshadowplane can be NULL. Do not deref that pointer, but forward NULL to the other plane-reset helpers. Clears plane-state to NULL. v2: - fix...