A fix for Bug#24486 "Valgrind warnings: sp_head(),

deadlock_innodb:events_grant". This was a memory leak introduced by 
the patch for Bug 22830.
Post-review fixes.

sql/sql_parse.cc

@@ -3925,6 +3925,7 @@ end_with_restore_list:
   }
   case SQLCOM_CREATE_EVENT:
   case SQLCOM_ALTER_EVENT:
+  do
   {
     DBUG_ASSERT(lex->event_parse_data);
     if (lex->table_or_sp_used())
@@ -3950,16 +3951,15 @@ end_with_restore_list:
     if (!res)
       send_ok(thd);
 
+  } while (0);
   /* Don't do it, if we are inside a SP */
   if (!thd->spcont)
   {
     delete lex->sphead;
     lex->sphead= NULL;
   }
-
   /* lex->unit.cleanup() is called outside, no need to call it here */
   break;
-  }
   case SQLCOM_DROP_EVENT:
   case SQLCOM_SHOW_CREATE_EVENT:
   {