Merge branch 'r8169-improve-runtime-pm'

Heiner Kallweit says:

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r8169: improve runtime pm

On my system with two network ports I found that runtime PM didn't
suspend the unused port. Therefore I checked runtime pm in this driver
in somewhat more detail and this series improves runtime pm in general
and solves the mentioned issue.

Tested on a system with RTL8168evl (MAC version 34).
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Signed-off-by: David S. Miller <davem@davemloft.net>