message: remove error check
  Memory region could be outside of the addressable memory
  => ignore errors
diff: @@ -177,10 +177,9 @@ pub fn reserve(physical_address: PhysAddr, size: usize) {
  );
  // we are able to ignore errors because it could be already reserved
  - PHYSICAL_FREE_LIST
  + let _ = PHYSICAL_FREE_LIST
  .lock()
  - .reserve(physical_address.as_usize(), size)
  - .expect("Unable to reserve memory region");
  + .reserve(physical_address.as_usize(), size);
  }
  pub fn print_information() {
  