Merge branch 's390-qeth-next'

Julian Wiedmann says:

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s390/qeth: updates 2021-10-25

please apply the following patch series for qeth to netdev's net-next tree.

This brings some minor maintenance improvements, and a bunch of cleanups
so that the W=1 build passes without warning.
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Signed-off-by: David S. Miller <davem@davemloft.net>