fix return errClose

weed/filer/cassandra/cassandra_store.go

@@ -220,7 +220,9 @@ func (store *CassandraStore) ListDirectoryEntries(ctx context.Context, dirPath u
 	}
 	if errClose := iter.Close(); errClose != nil {
 		glog.V(0).Infof("list iterator close: %v", errClose)
-		return lastFileName, errClose
+		if err == nil {
+			return lastFileName, errClose
+		}
 	}
 
 	return lastFileName, err

weed/filer/cassandra2/cassandra_store.go

@@ -221,7 +221,9 @@ func (store *Cassandra2Store) ListDirectoryEntries(ctx context.Context, dirPath
 
 	if errClose := iter.Close(); errClose != nil {
 		glog.V(0).Infof("list iterator close: %v", errClose)
-		return lastFileName, errClose
+		if err == nil {
+			return lastFileName, errClose
+		}
 	}
 
 	return lastFileName, err

weed/filer/mongodb/mongodb_store.go

@@ -332,7 +332,9 @@ func (store *MongodbStore) ListDirectoryPrefixedEntries(ctx context.Context, dir
 
 	if errClose := cur.Close(ctx); errClose != nil {
 		glog.V(0).InfofCtx(ctx, "list iterator close: %v", err)
-		return lastFileName, errClose
+		if err == nil {
+			return lastFileName, errClose
+		}
 	}
 
 	return lastFileName, err