drm/nouveau/fault/gv100-: fix memory leak on module unload

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/subdev/fault/base.c

@@ -146,6 +146,7 @@ nvkm_fault_dtor(struct nvkm_subdev *subdev)
 	struct nvkm_fault *fault = nvkm_fault(subdev);
 	int i;
 
+	nvkm_notify_fini(&fault->nrpfb);
 	nvkm_event_fini(&fault->event);
 
 	for (i = 0; i < fault->buffer_nr; i++) {