platform/x86: x86-android-tablets: Simplify node-group [un]registration

software_node_register_node_group() / software_node_unregister_node_group()
both accept a NULL node-group as argument.

So there is no need to check for the node-group being NULL before calling
these functions, remove the checks to simplify the code.

Note the "if (gpio_button_swnodes)" check for registering is kept because
that also guards the creation of a gpio-button platform-device.

Suggested-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://patch.msgid.link/20250920200713.20193-15-hansg@kernel.org
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: Hans de Goede

drivers/platform/x86/x86-android-tablets/core.c

@@ -387,14 +387,9 @@ static void x86_android_tablet_remove(struct platform_device *pdev)
 	if (exit_handler)
 		exit_handler();
 
-	if (gpio_button_swnodes)
-		software_node_unregister_node_group(gpio_button_swnodes);
-
-	if (swnode_group)
-		software_node_unregister_node_group(swnode_group);
-
-	if (gpiochip_node_group)
-		software_node_unregister_node_group(gpiochip_node_group);
+	software_node_unregister_node_group(gpio_button_swnodes);
+	software_node_unregister_node_group(swnode_group);
+	software_node_unregister_node_group(gpiochip_node_group);
 }
 
 static __init int x86_android_tablet_probe(struct platform_device *pdev)
@@ -430,20 +425,16 @@ static __init int x86_android_tablet_probe(struct platform_device *pdev)
 		break;
 	}
 
-	if (gpiochip_node_group) {
-		ret = software_node_register_node_group(gpiochip_node_group);
-		if (ret)
-			return ret;
-	}
+	ret = software_node_register_node_group(gpiochip_node_group);
+	if (ret)
+		return ret;
 
-	if (dev_info->swnode_group) {
-		ret = software_node_register_node_group(dev_info->swnode_group);
-		if (ret) {
-			x86_android_tablet_remove(pdev);
-			return ret;
-		}
-		swnode_group = dev_info->swnode_group;
+	ret = software_node_register_node_group(dev_info->swnode_group);
+	if (ret) {
+		x86_android_tablet_remove(pdev);
+		return ret;
 	}
+	swnode_group = dev_info->swnode_group;
 
 	if (dev_info->init) {
 		ret = dev_info->init(&pdev->dev);