Bug #22214852: MYSQL 5.5 AND 5.6: MAIN.KEY AND OTHER

               FAILURE WITH VALGRIND FOR RELEASE BUILD

Issue:
------
Initialization of variable with UNINIT_VAR is flagged by
valgrind 3.11.

SOLUTION:
---------
Initialize the variable to 0.

This is a backport of Bug# 14580121.

storage/myisam/mi_check.c

 /*
-   Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+   Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -138,7 +138,7 @@ int chk_del(MI_CHECK *param, register MI_INFO *info, uint test_flag)
 {
   reg2 ha_rows i;
   uint delete_link_length;
-  my_off_t empty,next_link,UNINIT_VAR(old_link);
+  my_off_t empty, next_link, old_link= 0;
   char buff[22],buff2[22];
   DBUG_ENTER("chk_del");