fixup! drm/asahi: Add the Asahi driver for Apple AGX GPUs

use kernel::error::code::* to avoid type confusion with u32

Signed-off-by: Janne Grunau <j@jannau.net>
(cherry picked from commit c07532e https://github.com/AsahiLinux/linux)
Signed-off-by: John Cabaj <john.cabaj@canonical.com>

Author: jannau

drivers/gpu/drm/asahi/file.rs

@@ -13,6 +13,7 @@ use crate::{alloc, buffer, driver, gem, mmu, queue};
 use core::mem::MaybeUninit;
 use kernel::dma_fence::RawDmaFence;
 use kernel::drm::gem::BaseObject;
+use kernel::error::code::*;
 use kernel::io_buffer::{IoBufferReader, IoBufferWriter};
 use kernel::prelude::*;
 use kernel::sync::{Arc, Mutex};