Updated expected error

mysql-test/r/ndb_alter_table.result

@@ -179,7 +179,7 @@ a	b	c
 2	two	two
 alter table t1 drop index c;
 select * from t1 where b = 'two';
-ERROR HY000: Table definition has changed, please retry transaction
+ERROR HY000: Can't lock file (errno: 241)
 select * from t1 where b = 'two';
 a	b	c
 2	two	two

mysql-test/t/ndb_alter_table.test

@@ -149,7 +149,7 @@ connection server1;
 alter table t1 drop index c;
 connection server2;
 # This should fail since index information is not automatically refreshed
---error 1105
+--error 1015
 select * from t1 where b = 'two';
 select * from t1 where b = 'two';
 connection server1;