drm/mtk: 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: Another driver with a bit much devm_kzalloc, which should
probably use drmm_kzalloc instead ...

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

v3: Use drmm_mode_config_init() for more clarity (Sam, Thomas)
Acked-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
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>
Link: https://patchwork.freedesktop.org/patch/msgid/20200323144950.3018436-41-daniel.vetter@ffwll.ch

drivers/gpu/drm/mediatek/mtk_drm_drv.c

@@ -162,7 +162,9 @@ static int mtk_drm_kms_init(struct drm_device *drm)
 	}
 	private->mutex_dev = &pdev->dev;
 
-	drm_mode_config_init(drm);
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
 
 	drm->mode_config.min_width = 64;
 	drm->mode_config.min_height = 64;
@@ -179,7 +181,7 @@ static int mtk_drm_kms_init(struct drm_device *drm)
 
 	ret = component_bind_all(drm->dev, drm);
 	if (ret)
-		goto err_config_cleanup;
+		return ret;
 
 	/*
 	 * We currently support two fixed data streams, each optional,
@@ -255,8 +257,6 @@ static int mtk_drm_kms_init(struct drm_device *drm)
 		dma_dev->dma_parms = NULL;
 err_component_unbind:
 	component_unbind_all(drm->dev, drm);
-err_config_cleanup:
-	drm_mode_config_cleanup(drm);
 
 	return ret;
 }
@@ -272,7 +272,6 @@ static void mtk_drm_kms_deinit(struct drm_device *drm)
 		private->dma_dev->dma_parms = NULL;
 
 	component_unbind_all(drm->dev, drm);
-	drm_mode_config_cleanup(drm);
 }
 
 static const struct file_operations mtk_drm_fops = {