LU-10737 misc: Wrong checksum return value

LU-10737 misc: Wrong checksum return value

In the checksum calculation functions: tgt_checksum_niobuf and
osc_checksum_bulk, it is wrongly taken the error return value
of cfs_crypto_hash_init as the checksum value.
This patch fixes the problem.

Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: I647c402deeab00ec5c6437423b0cab250b42c3e5
Reviewed-on: https://review.whamcloud.com/31448
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Li Xi <lixi@ddn.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>