I would use:

```rust
let flag_ptr: *u32 = addr_of_mut!((*CELL.get()).flag);
let val = flag_ptr.read_volatile();
if val == Magic::Good {
    let data_ptr: *mut Data = addr_of_mut!((*CELL.get()).data);
    return *data_ptr;
} else {
    return Data::default();
}
```