drm/nouveau/fifo: version the dma channel class struct

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c
index cf61dc0..e645184 100644
--- a/drivers/gpu/drm/nouveau/nouveau_chan.c
+++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
@@ -223,7 +223,7 @@
 {
 	static const u16 oclasses[] = { 0x406e, 0x176e, 0x006e, 0x006b, 0 };
 	const u16 *oclass = oclasses;
-	struct nv_channel_dma_class args;
+	struct nv03_channel_dma_class args;
 	struct nouveau_channel *chan;
 	int ret;