drm/nv50-nvc0: rename disp->evo to disp->master

More appropriate, and we're about to be using more than just the master
EVO channel.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv50_cursor.c b/drivers/gpu/drm/nouveau/nv50_cursor.c
index ba75f95..9752c35 100644
--- a/drivers/gpu/drm/nouveau/nv50_cursor.c
+++ b/drivers/gpu/drm/nouveau/nv50_cursor.c
@@ -38,7 +38,7 @@
 {
 	struct drm_device *dev = nv_crtc->base.dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_channel *evo = nv50_display(dev)->evo;
+	struct nouveau_channel *evo = nv50_display(dev)->master;
 	int ret;
 
 	NV_DEBUG_KMS(dev, "\n");
@@ -73,7 +73,7 @@
 {
 	struct drm_device *dev = nv_crtc->base.dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_channel *evo = nv50_display(dev)->evo;
+	struct nouveau_channel *evo = nv50_display(dev)->master;
 	int ret;
 
 	NV_DEBUG_KMS(dev, "\n");