ALTER EVENT in stored procedure body led to a crash during the
procedure call. Affected was only ALTER EVENT which changed the
interval of the event. No problems with AT, STARTS, ENDS and so on.



mysql-test/r/events_bugs.result:
  fix result
mysql-test/t/events_bugs.test:
  add test case for bug 22397 : Events, crash with procedure which alters body
sql/event_data_objects.cc:
  fix copy&paste error in code, which resulted in bug#22397
  Events: crash with procedure which alters body