all: use stack-allocated uuid at various places

No need to create a UUID on the heap in this case.

libnm-core/nm-connection.c

@@ -602,17 +602,17 @@ static gboolean
 _normalize_connection_uuid (NMConnection *self)
 {
 	NMSettingConnection *s_con = nm_connection_get_setting_connection (self);
-	char *uuid;
+	char uuid[37];
 
-	g_assert (s_con);
+	nm_assert (s_con);
 
 	if (nm_setting_connection_get_uuid (s_con))
 		return FALSE;
 
-	uuid = nm_utils_uuid_generate ();
-	g_object_set (s_con, NM_SETTING_CONNECTION_UUID, uuid, NULL);
-	g_free (uuid);
-
+	g_object_set (s_con,
+	              NM_SETTING_CONNECTION_UUID,
+	              nm_utils_uuid_generate_buf (uuid),
+	              NULL);
 	return TRUE;
 }
 

src/NetworkManagerUtils.c

@@ -217,7 +217,7 @@ nm_utils_complete_generic (NMPlatform *platform,
                            gboolean default_enable_ipv6)
 {
 	NMSettingConnection *s_con;
-	char *id, *uuid, *ifname;
+	char *id, *ifname;
 	GHashTable *parameters;
 
 	g_assert (fallback_id_prefix);
@@ -230,9 +230,9 @@ nm_utils_complete_generic (NMPlatform *platform,
 	g_object_set (G_OBJECT (s_con), NM_SETTING_CONNECTION_TYPE, ctype, NULL);
 
 	if (!nm_setting_connection_get_uuid (s_con)) {
-		uuid = nm_utils_uuid_generate ();
-		g_object_set (G_OBJECT (s_con), NM_SETTING_CONNECTION_UUID, uuid, NULL);
-		g_free (uuid);
+		char uuid[37];
+
+		g_object_set (G_OBJECT (s_con), NM_SETTING_CONNECTION_UUID, nm_utils_uuid_generate_buf (uuid), NULL);
 	}
 
 	/* Add a connection ID if absent */

src/devices/bluetooth/nm-bluez-device.c

@@ -183,7 +183,8 @@ pan_connection_check_create (NMBluezDevice *self)
 	NMConnection *connection;
 	NMConnection *added;
 	NMSetting *setting;
-	char *uuid, *id;
+	char *id;
+	char uuid[37];
 	GError *error = NULL;
 	NMBluezDevicePrivate *priv = NM_BLUEZ_DEVICE_GET_PRIVATE (self);
 
@@ -205,7 +206,7 @@ pan_connection_check_create (NMBluezDevice *self)
 	connection = nm_simple_connection_new ();
 
 	/* Setting: Connection */
-	uuid = nm_utils_uuid_generate ();
+	nm_utils_uuid_generate_buf (uuid);
 	id = g_strdup_printf (_("%s Network"), priv->name);
 	setting = nm_setting_connection_new ();
 	g_object_set (setting,
@@ -266,7 +267,6 @@ pan_connection_check_create (NMBluezDevice *self)
 	g_object_unref (connection);
 
 	g_free (id);
-	g_free (uuid);
 }
 
 static gboolean

src/devices/nm-device.c

@@ -3629,7 +3629,7 @@ nm_device_generate_connection (NMDevice *self, NMDevice *master)
 	NMSetting *s_con;
 	NMSetting *s_ip4;
 	NMSetting *s_ip6;
-	gs_free char *uuid = NULL;
+	char uuid[37];
 	const char *ip4_method, *ip6_method;
 	GError *error = NULL;
 	const NMPlatformLink *pllink;
@@ -3646,10 +3646,9 @@ nm_device_generate_connection (NMDevice *self, NMDevice *master)
 
 	connection = nm_simple_connection_new ();
 	s_con = nm_setting_connection_new ();
-	uuid = nm_utils_uuid_generate ();
 
 	g_object_set (s_con,
-	              NM_SETTING_CONNECTION_UUID, uuid,
+	              NM_SETTING_CONNECTION_UUID, nm_utils_uuid_generate_buf (uuid),
 	              NM_SETTING_CONNECTION_ID, ifname,
 	              NM_SETTING_CONNECTION_AUTOCONNECT, FALSE,
 	              NM_SETTING_CONNECTION_INTERFACE_NAME, ifname,