Fix BUG#2259: Crash after fetch from not-open cursor in stored procedure

Initialize and test properly when cleaning up, to avoid crash in some error cases.

mysql-test/r/sp-error.result

@@ -283,6 +283,15 @@ create table t3 (column_1 int)|
 call bug1653()|
 drop procedure bug1653|
 drop table t3|
+create procedure bug2259()
+begin
+declare v1 int;
+declare c1 cursor for select s1 from t10;
+fetch c1 into v1;
+end|
+call bug2259()|
+ERROR 24000: Cursor is not open
+drop procedure bug2259|
 create procedure bug2272()
 begin
 declare v int;
@@ -292,4 +301,5 @@ insert into t1 values (666, 51.3)|
 call bug2272()|
 ERROR 42S22: Unknown column 'v' in 'field list'
 delete from t1|
+drop procedure bug2272|
 drop table t1|