watchdog: iTCO_wdt: use dev_err() instead of pr_err()

Use dev_err() instead of pr_err(), so device name is also shown in the log.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210616181708.19530-2-info@metux.net


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>