Merge branch 'r8169-small-improvements'

Heiner Kallweit says:

====================
r8169: small improvements

This series includes a number of smaller improvements.

v2:
- return on WARN in patch 1
====================

Link: https://lore.kernel.org/r/938caef4-8a0b-bbbd-66aa-76f758ff877a@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>