ppp: on PPPoE, always send PADT when shutting down the connection

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 44097

package/network/services/ppp/patches/530-pppoe_send_padt.patch

+--- a/pppd/plugins/rp-pppoe/plugin.c
++++ b/pppd/plugins/rp-pppoe/plugin.c
+@@ -276,7 +276,7 @@ PPPOEDisconnectDevice(void)
+ 		sizeof(struct sockaddr_pppox)) < 0)
+ 	error("Failed to disconnect PPPoE socket: %d %m", errno);
+     close(conn->sessionSocket);
+-    /* don't send PADT?? */
++    sendPADT(conn, NULL);
+     if (conn->discoverySocket >= 0)
+ 	close(conn->discoverySocket);
+ }