gpio: aggregator: Fix error code in gpio_aggregator_activate()

gpio: aggregator: Fix error code in gpio_aggregator_activate()

Propagate the error code if gpio_aggregator_make_device_sw_node() fails.
Don't return success.

Fixes: 86f162e73d2d ("gpio: aggregator: introduce basic configfs interface")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/79b804a0769a434698616bebedacc0e5d5605fdc.1744452787.git.dan.carpenter@linaro.org
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>