Fix cargo check warnings and run rustfmt

Author: Jules-Bertholet

core/src/parking_lot.rs

@@ -248,7 +248,7 @@ fn create_hashtable() -> &'static HashTable {
             // Free the table we created
             // SAFETY: `new_table` is created from `Box::into_raw` above and only freed here.
             unsafe {
-                Box::from_raw(new_table);
+                let _ = Box::from_raw(new_table);
             }
             old_table
         }

core/src/thread_parker/windows/waitaddress.rs

@@ -10,6 +10,7 @@ use core::{
     sync::atomic::{AtomicUsize, Ordering},
 };
 use std::{ffi, time::Instant};
+
 use super::bindings::*;
 
 #[allow(non_snake_case)]