Currently, in case of using scatter/gather mode, head of data is not sent to

destination. The cause is second descriptor address is set to NEXT.

The NEXT must have head of descriptor address.

This patch sets head of descriptor address to the NEXT.
Acked-by: NYong Wang <youg.y.wang@intel.com>
Signed-off-by: NTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
[dan.j.williams@intel.com: fixed up usage of virt_to_phys()]
Signed-off-by: NDan Williams <dan.j.williams@intel.com>