[#547] metabase: Fix datarace in tests

Quite an old one bf9e938a3b.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/metabase/put.go

@@ -111,6 +111,7 @@ func (db *DB) put(tx *bbolt.Tx,
 
 	exists, err := db.exists(tx, objectCore.AddressOf(obj), currEpoch)
 
+	var splitInfoError *objectSDK.SplitInfoError
 	if errors.As(err, &splitInfoError) {
 		exists = true // object exists, however it is virtual
 	} else if err != nil {

pkg/local_object_storage/metabase/select.go

@@ -427,6 +427,7 @@ func (db *DB) selectObjectID(
 		addr.SetContainer(cnr)
 		addr.SetObject(id)
 
+		var splitInfoError *objectSDK.SplitInfoError
 		ok, err := db.exists(tx, addr, currEpoch)
 		if (err == nil && ok) || errors.As(err, &splitInfoError) {
 			raw := make([]byte, objectKeySize)

pkg/local_object_storage/metabase/util.go

@@ -120,8 +120,6 @@ const (
 	addressKeySize = cidSize + objectKeySize
 )
 
-var splitInfoError *objectSDK.SplitInfoError // for errors.As comparisons
-
 func bucketName(cnr cid.ID, prefix byte, key []byte) []byte {
 	key[0] = prefix
 	cnr.Encode(key[1:])