nm-setting-bridge: hide GObject structs from public API and embed private data

Hide the object and class structures from public API.

This is an API and ABI break, but of something that is very likely
unused.

This is mainly done to embed the private structure in the object itself.
This has benefits for performance and debugability.

libnm-core/nm-setting-bridge.c

@@ -63,9 +63,23 @@ typedef struct {
 	bool stp:1;
 } NMSettingBridgePrivate;
 
+/**
+ * NMSettingBridge:
+ *
+ * Bridging Settings
+ */
+struct _NMSettingBridge {
+	NMSetting parent;
+	NMSettingBridgePrivate _priv;
+};
+
+struct _NMSettingBridgeClass {
+	NMSettingClass parent;
+};
+
 G_DEFINE_TYPE (NMSettingBridge, nm_setting_bridge, NM_TYPE_SETTING)
 
-#define NM_SETTING_BRIDGE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_SETTING_BRIDGE, NMSettingBridgePrivate))
+#define NM_SETTING_BRIDGE_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMSettingBridge, NM_IS_SETTING_BRIDGE, NMSetting)
 
 /*****************************************************************************/
 
@@ -1182,8 +1196,6 @@ nm_setting_bridge_class_init (NMSettingBridgeClass *klass)
 	NMSettingClass *setting_class = NM_SETTING_CLASS (klass);
 	GArray *properties_override = _nm_sett_info_property_override_create_array ();
 
-	g_type_class_add_private (klass, sizeof (NMSettingBridgePrivate));
-
 	object_class->get_property = get_property;
 	object_class->set_property = set_property;
 	object_class->finalize     = finalize;

libnm-core/nm-setting-bridge.h

@@ -39,21 +39,7 @@ G_BEGIN_DECLS
 #define NM_BRIDGE_VLAN_VID_MIN            1
 #define NM_BRIDGE_VLAN_VID_MAX            4094
 
-/**
- * NMSettingBridge:
- *
- * Bridging Settings
- */
-struct _NMSettingBridge {
-	NMSetting parent;
-};
-
-typedef struct {
-	NMSettingClass parent;
-
-	/*< private >*/
-	gpointer padding[4];
-} NMSettingBridgeClass;
+typedef struct _NMSettingBridgeClass NMSettingBridgeClass;
 
 typedef struct _NMBridgeVlan NMBridgeVlan;