Revert "thermal/core: fix error code in __thermal_cooling_device_register()"

This reverts commit ed08f958 which is
commit e49a1e1e upstream.

It is part of a patch series applied to 5.15.91 that breaks the Android
kernel ABI.  If it is really needed, it can be brought back in an
abi-safe way in the future.

Bug: 161946584
Change-Id: I68e61966133593892412c9a8f17170776686710a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>