initfs: Actually use Length newtype

initfs/src/lib.rs

@@ -141,8 +141,7 @@ impl<'initfs> InodeStruct<'initfs> {
     }
     fn data(&self) -> Result<&'initfs [u8]> {
         let start: usize = self.inode.offset.0.get().try_into().map_err(|_| Error)?;
-
-        let length: usize = self.inode.length.get().try_into().map_err(|_| Error)?;
+        let length: usize = self.inode.length.0.get().try_into().map_err(|_| Error)?;
 
         let end = start.checked_add(length).ok_or(Error)?;
 

initfs/src/types.rs

@@ -81,7 +81,7 @@ const _: () = {
 #[derive(Clone, Copy, Debug)]
 pub struct InodeHeader {
     pub type_: U32,
-    pub length: U32,
+    pub length: Length,
     pub offset: Offset,
 }
 

initfs/tools/src/lib.rs

@@ -253,7 +253,7 @@ fn write_inode(
 
     *inode_hdr = initfs::InodeHeader {
         type_: (ty as u32).into(),
-        length: write_result.size.into(),
+        length: initfs::Length(write_result.size.into()),
         offset: initfs::Offset(write_result.offset.into()),
     };