Crash if a FETCH statement produces warnings

SET sql_mode=default;

DROP TABLE IF EXISTS t1;

DROP PROCEDURE IF EXISTS p1;

CREATE TABLE t1 (a INT, b VARCHAR(10));

INSERT INTO t1 VALUES (10,'11x');

INSERT INTO t1 VALUES (10,'12x');

DELIMITER $$;

CREATE PROCEDURE p1()

BEGIN

  DECLARE cur1 CURSOR FOR SELECT b FROM t1;

    BEGIN

    DECLARE res int;

    OPEN cur1;

    FETCH cur1 INTO res;

    CLOSE cur1;

  END;

END;

$$

DELIMITER ;$$

CALL p1();

SHOW WARNINGS;

#0  0x00007ffff5994a28 in raise () from /lib64/libc.so.6

#1  0x00007ffff599662a in abort () from /lib64/libc.so.6

#2  0x00007ffff598d227 in __assert_fail_base () from /lib64/libc.so.6

#3  0x00007ffff598d2d2 in __assert_fail () from /lib64/libc.so.6

#4  0x0000555555acbc73 in Diagnostics_area::set_ok_status (

    this=0x7ffec6c1b058, affected_rows=0, last_insert_id=0, message=0x0)

    at /home/bar/maria-git/server.10.2/sql/sql_error.cc:380

#5  0x0000555555a7f855 in my_ok (thd=0x7ffec6c16070, affected_rows=0, id=0, 

    message=0x0) at /home/bar/maria-git/server.10.2/sql/sql_class.h:4319

#6  0x0000555555af67ab in do_execute_sp (thd=0x7ffec6c16070, sp=0x7ffec6d80088)

    at /home/bar/maria-git/server.10.2/sql/sql_parse.cc:2891

#7  0x0000555555aff7a1 in mysql_execute_command (thd=0x7ffec6c16070)

    at /home/bar/maria-git/server.10.2/sql/sql_parse.cc:5771

#8  0x0000555555b05c29 in mysql_parse (thd=0x7ffec6c16070, 

    rawbuf=0x7ffec6c63088 "CALL p1()", length=9, parser_state=0x7ffff7f2dd20, 

    is_com_multi=false, is_next_command=false)

    at /home/bar/maria-git/server.10.2/sql/sql_parse.cc:7858