drm/arc: Embedd a drm_connector for sim case

Removes the last devm_kzalloc, which means we're now prepared to use
drmm_mode_config_cleanup!

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210112084358.2771527-5-daniel.vetter@ffwll.ch

drivers/gpu/drm/arc/arcpgu.h

@@ -15,6 +15,7 @@ struct arcpgu_drm_private {
 	void __iomem		*regs;
 	struct clk		*clk;
 	struct drm_simple_display_pipe pipe;
+	struct drm_connector	sim_conn;
 };
 
 #define dev_to_arcpgu(x) container_of(x, struct arcpgu_drm_private, drm)

drivers/gpu/drm/arc/arcpgu_sim.c

@@ -18,10 +18,6 @@
 #define YRES_MAX	8192
 
 
-struct arcpgu_drm_connector {
-	struct drm_connector connector;
-};
-
 static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
 {
 	int count;
@@ -57,7 +53,6 @@ static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
 int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
 {
 	struct arcpgu_drm_private *arcpgu = dev_to_arcpgu(drm);
-	struct arcpgu_drm_connector *arcpgu_connector;
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
 	int ret;
@@ -72,14 +67,7 @@ int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
 	if (ret)
 		return ret;
 
-	arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
-					GFP_KERNEL);
-	if (!arcpgu_connector) {
-		ret = -ENOMEM;
-		goto error_encoder_cleanup;
-	}
-
-	connector = &arcpgu_connector->connector;
+	connector = &arcpgu->sim_conn;
 	drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
 
 	ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,