Stored procedures: cursor loop behavior is incorrect

The loop terminates early in all these repros, returning only the first of 3 expected result rows.

Repro:

```sql
DROP TABLE IF EXISTS PEOPLE;
CREATE TABLE PEOPLE (NAME VARCHAR(30));

INSERT INTO PEOPLE VALUES
('John'), ('Mary'), ('Tim');

DROP PROCEDURE IF EXISTS LoopThroughCursorWithContinueHandlerAndLoop;
DELIMITER //
CREATE PROCEDURE LoopThroughCursorWithContinueHandlerAndLoop()
BEGIN
DECLARE person_name VARCHAR(30) DEFAULT NULL;
DECLARE done INT DEFAULT 0;

DECLARE cur_people CURSOR FOR
SELECT NAME FROM PEOPLE;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

OPEN cur_people;

people_loop: LOOP
FETCH cur_people INTO person_name;

IF done THEN
LEAVE people_loop;
END IF;

SELECT person_name AS PEOPLE_NAME;

END LOOP;

CLOSE cur_people;
END //

DELIMITER ;

CALL LoopThroughCursorWithContinueHandlerAndLoop();
```

```sql
DROP TABLE IF EXISTS PEOPLE;
CREATE TABLE PEOPLE (NAME VARCHAR(30));

INSERT INTO PEOPLE VALUES
('John'), ('Mary'), ('Tim');

DROP PROCEDURE IF EXISTS LoopThroughCursorWithContinueHandlerAndRepeat;
DELIMITER //
CREATE PROCEDURE LoopThroughCursorWithContinueHandlerAndRepeat()
BEGIN
DECLARE person_name VARCHAR(30) DEFAULT NULL;
DECLARE done INT DEFAULT 0;

DECLARE cur_people CURSOR FOR
SELECT NAME FROM PEOPLE;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

OPEN cur_people;

REPEAT
FETCH cur_people INTO person_name;

IF NOT done THEN
SELECT person_name AS PEOPLE_NAME;
END IF;
UNTIL done END REPEAT;

CLOSE cur_people;
END //

DELIMITER ;

CALL LoopThroughCursorWithContinueHandlerAndRepeat();
```

```sql
DROP TABLE IF EXISTS PEOPLE;
CREATE TABLE PEOPLE (NAME VARCHAR(30));

INSERT INTO PEOPLE VALUES
('John'), ('Mary'), ('Tim');

DROP PROCEDURE IF EXISTS LoopThroughCursorWithRowCount;
DELIMITER //

CREATE PROCEDURE LoopThroughCursorWithRowCount()
BEGIN
DECLARE person_name VARCHAR(30) DEFAULT NULL;
DECLARE done INT DEFAULT 0;
DECLARE row_count INT DEFAULT 0;
DECLARE current_row INT DEFAULT 0;
DECLARE cur_people CURSOR FOR
SELECT NAME FROM PEOPLE;

SELECT COUNT(*) INTO row_count
FROM PEOPLE;

OPEN cur_people;

WHILE current_row < row_count DO

FETCH cur_people INTO person_name;

SELECT person_name AS PEOPLE_NAME;

SET current_row = current_row + 1;
END WHILE;

CLOSE cur_people;
END //

DELIMITER ;

CALL LoopThroughCursorWithRowCount();
```