refactor: fix ext2 warnings

kernel/driver/fs/ext2/src/allocation.rs

@@ -98,7 +98,7 @@ impl Ext2Fs {
 
         inode.dtime = real_time().seconds as u32;
 
-        self.write_inode(ino, &inode).await?;
+        self.write_inode(ino, inode).await?;
 
         let inode_index = ino - 1;
         let group_index = inode_index / self.block_group_inode_count;

kernel/driver/fs/ext2/src/dir/mod.rs

@@ -10,7 +10,6 @@ use alloc::sync::Arc;
 use libk::{
     block,
     error::Error,
-    time::real_time,
     vfs::{
         CommonImpl, DirectoryImpl, DirectoryOpenPosition, Filename, Metadata, Node, NodeFlags,
         NodeRef,

kernel/driver/fs/ext2/src/lib.rs

@@ -16,7 +16,6 @@ use inode::{InodeAccess, InodeCache};
 use libk::{
     device::block::{cache::DeviceMapper, BlockDevice},
     error::Error,
-    time::real_time,
     vfs::{Filesystem, FilesystemMountOption, NodeRef},
 };
 use libk_util::OneTimeInit;