Merge branch 's390-qeth-fixes'

Julian Wiedmann says:

====================
s390/qeth: fixes 2018-03-20

Please apply one final set of qeth patches for 4.16.
All of these fix long-standing bugs, so please queue them up for -stable
as well.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>