iio: adc: ad7625: Add ending newlines to error messages

Error messages passed to dev_err_probe() are supposed to end in "\n".
Fix accordingly.

Fixes: b7ffd0fa ("iio: adc: ad7625: add driver")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Tested-by: Trevor Gamblin <tgamblin@baylibre.com>
Link: https://patch.msgid.link/20241230151030.3207529-2-u.kleine-koenig@baylibre.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>