btree_txn_commit
if (btree_txn_commit(ns->indx_txn) != BT_SUCCESS)
rc = btree_txn_commit(txn);
rc = btree_txn_commit(txn);
int btree_txn_commit(struct btree_txn *txn);
btree_txn_commit(ns->indx_txn) != BT_SUCCESS) {
btree_txn_commit(ns->data_txn) != BT_SUCCESS) {