drm/pl111: Drop explicit drm_mode_config_cleanup call

It's right above the drm_dev_put().

This is made possible by a preceeding patch which added a drmm_
cleanup action to drm_mode_config_init(), hence all we need to do to
ensure that drm_mode_config_cleanup() is run on final drm_device
cleanup is check the new error code for _init().

Aside: This driver gets its devm_ stuff all wrong wrt drm_device and
anything hanging off that. Not the only one unfortunately.

v2: Explain why this cleanup is possible (Laurent).

v3: Use drmm_mode_config_init() for more clarity (Sam, Thomas)
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200323144950.3018436-36-daniel.vetter@ffwll.ch

drivers/gpu/drm/pl111/pl111_drv.c

@@ -90,10 +90,13 @@ static int pl111_modeset_init(struct drm_device *dev)
 	struct drm_panel *panel = NULL;
 	struct drm_bridge *bridge = NULL;
 	bool defer = false;
-	int ret = 0;
+	int ret;
 	int i;
 
-	drm_mode_config_init(dev);
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		return ret;
+
 	mode_config = &dev->mode_config;
 	mode_config->funcs = &mode_config_funcs;
 	mode_config->min_width = 1;
@@ -154,7 +157,7 @@ static int pl111_modeset_init(struct drm_device *dev)
 						    DRM_MODE_CONNECTOR_Unknown);
 		if (IS_ERR(bridge)) {
 			ret = PTR_ERR(bridge);
-			goto out_config;
+			goto finish;
 		}
 	} else if (bridge) {
 		dev_info(dev->dev, "Using non-panel bridge\n");
@@ -197,8 +200,6 @@ static int pl111_modeset_init(struct drm_device *dev)
 out_bridge:
 	if (panel)
 		drm_panel_bridge_remove(bridge);
-out_config:
-	drm_mode_config_cleanup(dev);
 finish:
 	return ret;
 }
@@ -343,7 +344,6 @@ static int pl111_amba_remove(struct amba_device *amba_dev)
 	drm_dev_unregister(drm);
 	if (priv->panel)
 		drm_panel_bridge_remove(priv->bridge);
-	drm_mode_config_cleanup(drm);
 	drm_dev_put(drm);
 	of_reserved_mem_device_release(dev);