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/t/sp-error.test

@@ -388,6 +388,23 @@ call bug1653()|
 drop procedure bug1653|
 drop table t3|
 
+#
+# BUG#2259
+#
+# Note: When this bug existed, it did not necessarily cause a crash
+#       in all builds, but valgrind did give warnings.
+create procedure bug2259()
+begin
+  declare v1 int;
+  declare c1 cursor for select s1 from t10;
+
+  fetch c1 into v1;
+end|
+
+--error 1310
+call bug2259()|
+drop procedure bug2259|
+
 #
 # BUG#2272
 #
@@ -402,6 +419,7 @@ insert into t1 values (666, 51.3)|
 --error 1054
 call bug2272()|
 delete from t1|
+drop procedure bug2272|
 
 drop table t1|