drm/ast: Fix memleak in error path in ast_bo_create()

The allocated struct ast_bo was not freed in all error paths.
This patch consolidates error handling and fixes this.
Signed-off-by: NEgbert Eich <eich@suse.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/ast/ast_ttm.c

@@ -323,10 +323,8 @@ int ast_bo_create(struct drm_device *dev, int size, int align,
 		return -ENOMEM;
 
 	ret = drm_gem_object_init(dev, &astbo->gem, size);
-	if (ret) {
-		kfree(astbo);
-		return ret;
-	}
+	if (ret)
+		goto error;
 
 	astbo->bo.bdev = &ast->ttm.bdev;
 
@@ -340,10 +338,13 @@ int ast_bo_create(struct drm_device *dev, int size, int align,
 			  align >> PAGE_SHIFT, false, NULL, acc_size,
 			  NULL, NULL, ast_bo_ttm_destroy);
 	if (ret)
-		return ret;
+		goto error;
 
 	*pastbo = astbo;
 	return 0;
+error:
+	kfree(astbo);
+	return ret;
 }
 
 static inline u64 ast_bo_gpu_offset(struct ast_bo *bo)