ASoC: amd/sdw: Fix confusing cleanup.h

Merge series from Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>:

cleanup.h coding style asks to avoid having constructors with redundant
values (= NULL). On purpose, because it is just not making the code
simpler. The constructor should be meaningful not just NULL.

If you do not agree in declaration-in-place-of-use (fair!), then do not
use cleanup.h. If you want to use cleanup.h, then please read cleanup.h
before.