drm/nouveau/client: convert to new-style nvkm_object

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/include/nvif/client.h b/drivers/gpu/drm/nouveau/include/nvif/client.h
index 4d5db80..4a7f6f7 100644
--- a/drivers/gpu/drm/nouveau/include/nvif/client.h
+++ b/drivers/gpu/drm/nouveau/include/nvif/client.h
@@ -23,6 +23,6 @@
 #include <core/client.h>
 #define nvxx_client(a) ({                                                      \
 	struct nvif_client *_client = (a);                                     \
-	nvkm_client(_client->object.priv);                                     \
+	(struct nvkm_client *)_client->object.priv;                            \
 })
 #endif