Merge branch 's390-qeth-next'

Julian Wiedmann says:

====================
s390/qeth: updates 2018-09-17

please apply the following patchset to net-next. This brings more restructuring
of qeth's transmit code (eliminating its last usage of skb_realloc_headroom()),
and the usual mix of minor improvements & cleanups.
====================

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