LU-8057 ko2iblnd: Replace sg++ with sg = sg_next(sg)

LU-8057 ko2iblnd: Replace sg++ with sg = sg_next(sg)

With scatterlist chaining, simply incrementing the array does not
work. sg_next macro was thus introduced to follow the chain links
when necessary. So replace sg++ with sg_next.

This change was made with the help of the following Coccinelle
semantic patch:
//<smpl>
@@
 struct scatterlist *sg;
@@
 -sg++
 +sg = sg_next(sg)
//</smpl>

In my test of the upstream client this change exposed a long
standing issues where we have a offset that is not page aligned
would cause us to access memory beyond the scatter gather list
which was causing memory corruption when all 256 fragments were
in use.

Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Change-Id: I5bc140645b841aa2a92da434ffa65795112c6cec
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: http://review.whamcloud.com/19342
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>