branches/zip: innodb.test: Fix the result, now that fast index creation

reports duplicate key values.  The reported value may depend on the
size of the main-memory merge sort buffer (row_merge_block_t).

mysql-test/innodb.result

@@ -2005,7 +2005,7 @@ explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a  '
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
 alter table t1 add unique(v);
-ERROR 23000: Duplicate entry '' for key 'v_2'
+ERROR 23000: Duplicate entry 'v' for key 'v_2'
 alter table t1 add key(v);
 select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a';
 qq