Fix as the compiler orders:
```
warning: unused return value of `into_raw_fd` that must be used
   --> ../src/yjit/src/disasm.rs:123:21
    |
123 |                     file.into_raw_fd(); // keep the fd open
    |                     ^^^^^^^^^^^^^^^^^^
    |
    = note: losing the raw file descriptor may leak resources
    = note: `#[warn(unused_must_use)]` on by default
help: use `let _ = ...` to ignore the resulting value
    |
123 |                     let _ = file.into_raw_fd(); // keep the fd open
    |                     +++++++

warning: unused return value of `into_raw_fd` that must be used
  --> ../src/yjit/src/log.rs:84:21
   |
84 |                     file.into_raw_fd(); // keep the fd open
   |                     ^^^^^^^^^^^^^^^^^^
   |
   = note: losing the raw file descriptor may leak resources
help: use `let _ = ...` to ignore the resulting value
   |
84 |                     let _ = file.into_raw_fd(); // keep the fd open
   |                     +++++++
```