drm: rcar-du: Drop local encoder variable

The local encoder variable is an alias for &renc->base, and is only use
twice. It doesn't help much, drop it, along with the
rcar_encoder_to_drm_encoder() macro that is then unused.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_encoder.c

@@ -61,7 +61,6 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 			 struct device_node *enc_node)
 {
 	struct rcar_du_encoder *renc;
-	struct drm_encoder *encoder;
 	struct drm_bridge *bridge;
 	int ret;
 
@@ -107,12 +106,11 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 		return -ENOMEM;
 
 	renc->output = output;
-	encoder = rcar_encoder_to_drm_encoder(renc);
 
 	dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
 		enc_node, output);
 
-	ret = drm_encoder_init(&rcdu->ddev, encoder, &rcar_du_encoder_funcs,
+	ret = drm_encoder_init(&rcdu->ddev, &renc->base, &rcar_du_encoder_funcs,
 			       DRM_MODE_ENCODER_NONE, NULL);
 	if (ret < 0) {
 		kfree(renc);
@@ -128,5 +126,5 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 	 * Attach the bridge to the encoder. The bridge will create the
 	 * connector.
 	 */
-	return drm_bridge_attach(encoder, bridge, NULL, 0);
+	return drm_bridge_attach(&renc->base, bridge, NULL, 0);
 }

drivers/gpu/drm/rcar-du/rcar_du_encoder.h

@@ -22,8 +22,6 @@ struct rcar_du_encoder {
 #define to_rcar_encoder(e) \
 	container_of(e, struct rcar_du_encoder, base)
 
-#define rcar_encoder_to_drm_encoder(e)	(&(e)->base)
-
 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 			 enum rcar_du_output output,
 			 struct device_node *enc_node);