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 ctxrestoremidbb[0].cs as well to avoid leaking the allocation when the configfs device is removed.
(cherry picked from commit a235e7d0098337c3f2d1e8f3610c719a589e115f)