ubifs: Fix wrong orphan node deletion in ubifs_jnl_update|rename

There a wrong orphan node deleting in error handling path in
ubifs_jnl_update() and ubifs_jnl_rename(), which may cause
following error msg:

  UBIFS error (ubi0:0 pid 1522): ubifs_delete_orphan [ubifs]:
  missing orphan ino 65

Fix this by checking whether the node has been operated for
adding to orphan list before being deleted,

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Fixes: 823838a4

 ("ubifs: Add hashes to the tree node cache")
Signed-off-by: Richard Weinberger <richard@nod.at>