ocfs2: old mle put and release after the function dlm_add_migration_mle called

If the old mle is found after the dlm_add_migration_mle called, it should
be put once.  If the return value is not - EEXIST and its type is BLOCK,
it should be put again to release it to avoid memory leak, for it had been
unhashed from the map.

Link: http://lkml.kernel.org/r/71604351584F6A4EBAE558C676F37CA4A3D4B7FE@H3CMLB12-EX.srv.huawei-3com.com


Signed-off-by: Guozhonghua <guozhonghua@h3c.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>