drm/ast: Use managed mode-config init

Using drmm_mode_config_init() sets up managed release of modesetting
resources. The existing modesetting's finalizer is empty, so remove it.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200702115029.5281-14-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_drv.h

@@ -287,7 +287,6 @@ struct ast_crtc_state {
 #define to_ast_crtc_state(state) container_of(state, struct ast_crtc_state, base)
 
 extern int ast_mode_init(struct drm_device *dev);
-extern void ast_mode_fini(struct drm_device *dev);
 
 #define AST_MM_ALIGN_SHIFT 4
 #define AST_MM_ALIGN_MASK ((1 << AST_MM_ALIGN_SHIFT) - 1)

drivers/gpu/drm/ast/ast_main.c

@@ -473,7 +473,9 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
 	if (ret)
 		goto out_free;
 
-	drm_mode_config_init(dev);
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		goto out_free;
 
 	dev->mode_config.funcs = (void *)&ast_mode_funcs;
 	dev->mode_config.min_width = 0;
@@ -516,8 +518,6 @@ void ast_driver_unload(struct drm_device *dev)
 
 	ast_release_firmware(dev);
 	kfree(ast->dp501_fw_addr);
-	ast_mode_fini(dev);
-	drm_mode_config_cleanup(dev);
 
 	ast_mm_fini(ast);
 	kfree(ast);

drivers/gpu/drm/ast/ast_mode.c

@@ -1110,10 +1110,6 @@ int ast_mode_init(struct drm_device *dev)
 	return 0;
 }
 
-void ast_mode_fini(struct drm_device *dev)
-{
-}
-
 static int get_clock(void *i2c_priv)
 {
 	struct ast_i2c_chan *i2c = i2c_priv;