LU-4676 hsm: Fix return value error of ct_run()

LU-4676 hsm: Fix return value error of ct_run()

ct_run() returns 0 after find out that fs_name is invalid.
lhsmtool_posix will exists with 0 after that error happens.
That might mislead scripts calling lhsmtool_posix.

Lustre-change: http://review.whamcloud.com/9412
Lustre-commit: d5ad6ff819e635c6ba337586cf70698b7728ff7f

Change-Id: Id182e989011e02104b5960c6692995825d939ad6
Signed-off-by: Li Xi <lixi@ddn.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: jacques-Charles Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/10234