drm/nouveau/kms/nv50: remove code to support non-atomic page flips

Made completely unreachable (and broken) by atomic commits.

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

drivers/gpu/drm/nouveau/nv10_fence.c

@@ -57,10 +57,7 @@ void
 nv10_fence_context_del(struct nouveau_channel *chan)
 {
 	struct nv10_fence_chan *fctx = chan->fence;
-	int i;
 	nouveau_fence_context_del(&fctx->base);
-	for (i = 0; i < ARRAY_SIZE(fctx->head); i++)
-		nvif_object_fini(&fctx->head[i]);
 	nvif_object_fini(&fctx->sema);
 	chan->fence = NULL;
 	nouveau_fence_context_free(&fctx->base);