LU-2076 osp: fix typo in osp2fsname

LU-2076 osp: fix typo in osp2fsname

Fix name converstion problem for ospname-->fsname.

Signed-off-by: Wang Di <di.wang@whamcloud.com>
Change-Id: I402639e0b5bce49af844e7979b290267e689c9dc
Reviewed-on: http://review.whamcloud.com/4157
Tested-by: Hudson
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Mike Pershin <tappro@whamcloud.com>