drm/nouveau: rename nv40_mpeg to nv31_mpeg

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index 109f0d9..93a2e83 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -634,7 +634,7 @@
 		}
 
 		if (dev_priv->card_type == NV_40)
-			nv40_mpeg_create(dev);
+			nv31_mpeg_create(dev);
 		else
 		if (dev_priv->card_type == NV_50 &&
 		    (dev_priv->chipset < 0x98 || dev_priv->chipset == 0xa0))