CVE-2026-23421 drm/xe/configfs: Free ctx_restore_mid_bb in release

In the Linux kernel, the following vulnerability has been resolved: drm/xe/configfs: Free ctxrestoremidbb in release ctxrestoremidbb memory is allocated in wabbstore, but xeconfigdevicerelease only frees ctxrestorepostbb. Free ctxrestoremidbb0.cs as well to avoid leaking the allocation when the...