s390/qeth: use mm helpers

Slightly reduce the complexity of the core xmit path, by replacing some
open-coded logic with the corresponding helpers.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-06-11 18:37:49 +02:00 • committed by David S. Miller
commit 4e2fe4edca