[#1388] metabase: Drop unused

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/metabase/delete.go

@@ -77,8 +77,6 @@ func (p *DeletePrm) SetAddresses(addrs ...oid.Address) {
 type referenceNumber struct {
 	all, cur int
 
-	addr oid.Address
-
 	obj *objectSDK.Object
 }
 
@@ -295,9 +293,8 @@ func (db *DB) delete(tx *bbolt.Tx, addr oid.Address, refCounter referenceCounter
 		nRef, ok := refCounter[k]
 		if !ok {
 			nRef = &referenceNumber{
-				all:  parentLength(tx, parAddr),
-				addr: parAddr,
-				obj:  parent,
+				all: parentLength(tx, parAddr),
+				obj: parent,
 			}
 
 			refCounter[k] = nRef