drm: rcar-du: Remove memory allocation error message

Memory allocation failures print messages to the kernel log, there's no
need to print an extra one. Remove the duplicate message.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

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

@@ -241,10 +241,8 @@ int rcar_du_lvdsenc_init(struct rcar_du_device *rcdu)
 
 	for (i = 0; i < rcdu->info->num_lvds; ++i) {
 		lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
-		if (lvds == NULL) {
-			dev_err(&pdev->dev, "failed to allocate private data\n");
+		if (lvds == NULL)
 			return -ENOMEM;
-		}
 
 		lvds->dev = rcdu;
 		lvds->index = i;