CVE-2025-40110 drm/vmwgfx: Fix a null-ptr access in the cursor snooper

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Fix a null-ptr access in the cursor snooper Check that the resource which is converted to a surface exists before trying to use the cursor snooper on it. vmwcmdrescheck allows explicit invalid SVGA3DINVALIDID...