f fix unused var warning

Author: TheBlueMatt

lightning/src/sync/debug_sync.rs

@@ -124,7 +124,7 @@ impl LockMetadata {
 		res
 	}
 
-	fn pre_lock(this: &Arc<LockMetadata>, double_lock_self_allowed: bool) {
+	fn pre_lock(this: &Arc<LockMetadata>, _double_lock_self_allowed: bool) {
 		LOCKS_HELD.with(|held| {
 			// For each lock which is currently locked, check that no lock's locked-before
 			// set includes the lock we're about to lock, which would imply a lockorder
@@ -136,7 +136,7 @@ impl LockMetadata {
 					// must be maintained, and doing so across a set of otherwise-identical mutexes
 					// is fraught with issues.
 					#[cfg(feature = "backtrace")]
-					debug_assert!(double_lock_self_allowed,
+					debug_assert!(_double_lock_self_allowed,
 						"Tried to acquire a lock while it was held!\nLock constructed at {}",
 						get_construction_location(&this._lock_construction_bt));
 					#[cfg(not(feature = "backtrace"))]