hwmon: (twl4030-madc-hwmon) Return proper error if hwmon_device_register fails
The driver did not return an error if the call to hwmon_device_register failed. Fix by returning the error reported from hwmon_device_register. Signed-off-by: NAxel Lin <axel.lin@gmail.com> Signed-off-by: NGuenter Roeck <guenter.roeck@ericsson.com>
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