When the remap 'from' parameter matches an IOV end we try to split that IOV
exactly at its end and effectively create an IOV with zero length.
With the off-by-one fix we will skip the IOV in such case as expected.
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>