LU-3316 obdclass: fix wrong device put in case of race

LU-3316 obdclass: fix wrong device put in case of race

The ls_device_put() might be called from local_oid_storage_fini()
wrongly if mutex-protected check failed due to race

Signed-off-by: Mikhail Pershin <mike.pershin@intel.com>
Change-Id: Ia2707d5db84b6bb6e9a5558c08b03028de8b9d50
Reviewed-on: http://review.whamcloud.com/6334
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>