Merge branch 's390-qeth-next'

Julian Wiedmann says:

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s390/qeth: updates 2020-09-23

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

This brings all sorts of cleanups. Highlights are more code sharing in
the init/teardown paths, and more fine-grained rollback on errors during
initialization (instead of a full-blown teardown).
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Signed-off-by: David S. Miller <[email protected]>