fixup! rust: sync: Replace static LockClassKey refs with a pointer wrapper

Author: jannau

rust/kernel/sync/lockdep.rs

@@ -41,4 +41,6 @@ impl LockClassKey {
 // SAFETY: `bindings::lock_class_key` just represents an opaque memory location, and is never
 // actually dereferenced.
 unsafe impl Send for LockClassKey {}
+// SAFETY: `bindings::lock_class_key` just represents an opaque memory location, and is never
+// actually dereferenced.
 unsafe impl Sync for LockClassKey {}