drm/nv40/graph: fix typo in type names

nv04_graph_priv / nv04_graph_chan are not defined in this context...

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/core/engine/graph/nv40.c b/drivers/gpu/drm/nouveau/core/engine/graph/nv40.c
index 8d00210..4250012 100644
--- a/drivers/gpu/drm/nouveau/core/engine/graph/nv40.c
+++ b/drivers/gpu/drm/nouveau/core/engine/graph/nv40.c
@@ -156,8 +156,8 @@
 static int
 nv40_graph_context_fini(struct nouveau_object *object, bool suspend)
 {
-	struct nv04_graph_priv *priv = (void *)object->engine;
-	struct nv04_graph_chan *chan = (void *)object;
+	struct nv40_graph_priv *priv = (void *)object->engine;
+	struct nv40_graph_chan *chan = (void *)object;
 	u32 inst = 0x01000000 | nv_gpuobj(chan)->addr >> 4;
 	int ret = 0;