LU-8232 obdclass: remove dead code

LU-8232 obdclass: remove dead code

No need to check for rc since it is never assigned after declaration
and sub-calls do not return error codes.

Test-Parameters: trivial

Change-Id: I040a45e8a779b11840c8c883fd4d5d87ee7f0fed
Signed-off-by: Henri Doreau <henri.doreau@cea.fr>
Reviewed-on: http://review.whamcloud.com/20587
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>