leds: turris-omnia: Use dev_err_probe() where appropriate

Use dev_err_probe() instead of dev_err() + separate return where
appropriate.

Signed-off-by: Marek Behún <kabel@kernel.org>
Link: https://lore.kernel.org/r/20241111100355.6978-11-kabel@kernel.org


Signed-off-by: Lee Jones <lee@kernel.org>