Merge branch 'davicom-w-1-fixes'

Andrew Lunn says:

====================
davicom W=1 fixes

Fixup various W=1 warnings, and then add COMPILE_TEST support, which
explains why these where missed on the previous pass.
====================

Link: https://lore.kernel.org/r/20201031005833.1060316-1-andrew@lunn.ch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>