staging/lustre/llite: check return value for obd_set_info_async

The return value is ignored in client_common_fill_super.
Restore to check it and error out.

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-on: http://review.whamcloud.com/21125
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8360


Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>