LU-12811 ptlrpc: pass buflen to lustre_swab_object_update_*()

LU-12811 ptlrpc: pass buflen to lustre_swab_object_update_*()

Pass the buffer size to the swabbing functions
lustre_swab_object_update_reply() and
lustre_swab_object_update_request() to avoid invalid access,
especially for small buffer.

Signed-off-by: Emoly Liu <emoly@whamcloud.com>
Change-Id: I229c1946ec3c088c7804762655f143dc419b2ea0
Reviewed-on: https://review.whamcloud.com/36867
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>