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 <[e-mail]>
Acked-by: Koichiro Den <[e-mail]>
Link: https://lore.kernel.org/r/79b80[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-aggregator.c

···
 		return -ENOMEM;
 
 	swnode = gpio_aggregator_make_device_sw_node(aggr);
-	if (IS_ERR(swnode))
+	if (IS_ERR(swnode)) {
+		ret = PTR_ERR(swnode);
 		goto err_remove_lookups;
+	}
 
 	memset(&pdevinfo, 0, sizeof(pdevinfo));
 	pdevinfo.name = DRV_NAME;