LU-7065 lod: Fix free of already added target description

LU-7065 lod: Fix free of already added target description

In lod_add_device() we may free tgt_desc after adding it to the ldt
if error happens in lod_sub_init_llog() or lfsck_add_target().

Change-Id: Ifb267378db996ae3a86da75b03427fb01eb0d73a
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-on: http://review.whamcloud.com/16441
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>