drm/ast: drop debug level on error printk

This was never an error, drop to a debug print.

Reported-by: Keven Lachance
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/ast/ast_mode.c

@@ -841,7 +841,7 @@ int ast_cursor_init(struct drm_device *dev)
 
 	ast->cursor_cache = obj;
 	ast->cursor_cache_gpu_addr = gpu_addr;
-	DRM_ERROR("pinned cursor cache at %llx\n", ast->cursor_cache_gpu_addr);
+	DRM_DEBUG_KMS("pinned cursor cache at %llx\n", ast->cursor_cache_gpu_addr);
 	return 0;
 fail:
 	return ret;