staging/lustre: lov_io_init() should return error code

lov_io_init_empty/release() should returns error code instead of
true on error case.

Fault IO needs to handle restart in the case of accessing HSM released
file

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Reviewed-on: http://review.whamcloud.com/17240
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7446


Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>