LU-4694 hsm: Cleanup codes about return value

LU-4694 hsm: Cleanup codes about return value

errno migh be zero when llapi_hsm_action_get_fd() returns a failure.
ct_archive() does not handle it correctly, which might cause HSM take
the operation as successful even if it actually fails.

The patch also cleanup other codes about return value.

Signed-off-by: Li Xi <lixi@ddn.com>
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: I625da68836f98346b104533a556c72f06232e3ef
Reviewed-on: http://review.whamcloud.com/9455
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Robert Read <robert.read@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>