unused symbols in oak_restricted_kernel

[tiziano88]

❯ cargo check
    Checking oak_functions_service v0.1.0 (/home/tzn/src/oak/oak_functions_service)
warning: unused import: `Stage0DiceData`
  --> oak_restricted_kernel/src/syscall/dice_data.rs:19:52
   |
19 | use oak_dice::evidence::{RestrictedKernelDiceData, Stage0DiceData};
   |                                                    ^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused variable: `buf`
  --> oak_restricted_kernel/src/syscall/dice_data.rs:87:25
   |
87 |     fn write(&mut self, buf: &[u8]) -> Result<isize, oak_restricted_kernel_interface::Errno> {
   |                         ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: struct `WriteState` is never constructed
  --> oak_restricted_kernel/src/syscall/dice_data.rs:50:8
   |
50 | struct WriteState {
   |        ^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: `oak_restricted_kernel` (lib) generated 3 warnings (run `cargo fix --lib -p oak_restricted_kernel` to apply 2 suggestions)
    Checking oak_functions_containers_app v0.1.0 (/home/tzn/src/oak/oak_functions_containers_app)
    Checking oak_functions_enclave_service v0.1.0 (/home/tzn/src/oak/oak_functions_enclave_service)
    Finished dev [unoptimized + debuginfo] target(s) in 0.58s

@jul-sh I haven't looked closely, but this sounds related to some of your changes? if not, could you re-assign to who may know more about it?