Guenter,
The hwmon-next branch is based on v5.5-rc1. It might be better to
either merge hwmon-next into mainline, or to apply the drivetemp patch
to mainline, and test the result. I have seen some (unrelated) weird
tracebacks in the driver core with v5.5-rc1, so that may not be the
best baseline for a test.
I'm afraid the warnings still happen with hwmon-next on top of
linus/master.