watchdog: s3c2410: Remove superfluous err label

'err' label in probe function is not really need, it just returns.
Remove it and replace all 'goto' statements with actual returns in
place.

No functional change here, just a cleanup patch.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20211107202943.8859-12-semen.protsenko@linaro.org


[groeck: Fixed context conflicts]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>