[#1555] engine: Refactor (*StorageEngine).GetLocks

Refactored after renaming the method to replace the confusing `locked`
variable with `locks`.

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

pkg/local_object_storage/engine/inhume.go

@@ -262,23 +262,23 @@ func (e *StorageEngine) GetLocks(ctx context.Context, addr oid.Address) ([]oid.I
 		))
 	defer span.End()
 
-	var locked []oid.ID
+	var allLocks []oid.ID
 	var outErr error
 
 	e.iterateOverUnsortedShards(func(h hashedShard) (stop bool) {
-		ld, err := h.Shard.GetLocks(ctx, addr)
+		locks, err := h.Shard.GetLocks(ctx, addr)
 		if err != nil {
 			e.reportShardError(ctx, h, logs.EngineInterruptGettingLockers, err, zap.Stringer("address", addr),
 				zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
 			outErr = err
 		}
-		locked = append(locked, ld...)
+		allLocks = append(allLocks, locks...)
 		return false
 	})
-	if len(locked) > 0 {
-		return locked, nil
+	if len(allLocks) > 0 {
+		return allLocks, nil
 	}
-	return locked, outErr
+	return allLocks, outErr
 }
 
 func (e *StorageEngine) processExpiredTombstones(ctx context.Context, addrs []meta.TombstonedObject) {