typo fixed

mysql-test/r/fulltext.result:
  new test
mysql-test/t/fulltext.test:
  new test

myisam/ft_boolean_search.c

@@ -123,7 +123,7 @@ void _ftb_parse_query(FTB *ftb, byte **start, byte *end,
         ftbe->up=up;
         ftbe->ythresh=0;
         ftbe->docid=HA_POS_ERROR;
-        if (ftbw->yesno > 0) up->ythresh++;
+        if (ftbe->yesno > 0) up->ythresh++;
         _ftb_parse_query(ftb, start, end, ftbe, depth+1,
                          (param.yesno<0 ? depth+1 : ndepth));
         break;

mysql-test/r/fulltext.result

@@ -45,6 +45,9 @@ select * from t1 where MATCH(a,b) AGAINST("+search +(support vector)" IN BOOLEAN
 a	b
 MySQL has now support	for full-text search
 Full-text search in MySQL	implements vector space model
+select * from t1 where MATCH(a,b) AGAINST("+search -(support vector)" IN BOOLEAN MODE);
+a	b
+Function MATCH ... AGAINST()	is used to do a search
 delete from t1 where a like "MySQL%";
 drop table t1;
 CREATE TABLE t1 (

mysql-test/t/fulltext.test

@@ -20,6 +20,7 @@ select * from t1 where MATCH(a,b) AGAINST("sear*" IN BOOLEAN MODE);
 select * from t1 where MATCH(a,b) AGAINST("+support +collections" IN BOOLEAN MODE);
 select * from t1 where MATCH(a,b) AGAINST("+search" IN BOOLEAN MODE);
 select * from t1 where MATCH(a,b) AGAINST("+search +(support vector)" IN BOOLEAN MODE);
+select * from t1 where MATCH(a,b) AGAINST("+search -(support vector)" IN BOOLEAN MODE);
 delete from t1 where a like "MySQL%";
 drop table t1;