[PATCH 4/4] rust: sync: lock: use DropGuard

[Mohamed Osama <mohamed.osama189110@gmail.com>]

Replace the ScopeGuard usage in the Rust locking implementation with
DropGuard.

The guard preserves the existing scope-exit cleanup behavior while using
the DropGuard API from the Rust kernel memory module.

Signed-off-by: Mohamed Osama <mohamed.osama189110@gmail.com>
---
 rust/kernel/sync/lock.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs
index 10b6b5e9b024..15f9cbe76c8d 100644
--- a/rust/kernel/sync/lock.rs
+++ b/rust/kernel/sync/lock.rs
@@ -7,8 +7,9 @@
 
 use super::LockClassKey;
 use crate::{
+    mem::DropGuard,
     str::{CStr, CStrExt as _},
-    types::{NotThreadSafe, Opaque, ScopeGuard},
+    types::{NotThreadSafe, Opaque},
 };
 use core::{cell::UnsafeCell, marker::PhantomPinned, pin::Pin};
 use pin_init::{pin_data, pin_init, PinInit, Wrapper};
@@ -242,7 +243,7 @@ pub(crate) fn do_unlocked<U>(&mut self, cb: impl FnOnce() -> U) -> U {
         // SAFETY: The caller owns the lock, so it is safe to unlock it.
         unsafe { B::unlock(self.lock.state.get(), &self.state) };
 
-        let _relock = ScopeGuard::new(||
+        let _relock = DropGuard::new((), |_|
                 // SAFETY: The lock was just unlocked above and is being relocked now.
                 unsafe { B::relock(self.lock.state.get(), &mut self.state) });
 
-- 
2.43.0