fix pppoe on dynamically assigned interfaces

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9852 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/ppp/files/pppoe.sh

@@ -6,8 +6,6 @@ setup_interface_pppoe() {
 	local iface="$1"
 	local config="$2"
 	
-	config_get device "$config" device
-
 	for module in slhc ppp_generic pppox pppoe; do
 		/sbin/insmod $module 2>&- >&-
 	done
@@ -22,5 +20,5 @@ setup_interface_pppoe() {
 	start_pppd "$config" \
 		plugin rp-pppoe.so \
 		mtu $mtu mru $mtu \
-		"nic-$device"
+		"nic-$iface"
 }