[package] ppp: bring pppoa script in sync with updated ppp logic

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21287 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/ppp/files/pppoa.sh

@@ -1,28 +1,37 @@
-scan_pppoa() {
-	scan_ppp "$@"
+stop_interface_pppoa() {
+	stop_interface_ppp "$1"
 }
 
 setup_interface_pppoa() {
 	local iface="$1"
 	local config="$2"
-	
+
+	local device
 	config_get device "$config" device
+
+	local vpi
 	config_get vpi "$config" vpi
+
+	local vci
 	config_get vci "$config" vci
 
 	for module in slhc ppp_generic pppoatm; do
 		/sbin/insmod $module 2>&- >&-
 	done
-	
+
+	local encaps
 	config_get encaps "$config" encaps
+
 	case "$encaps" in
-		1|vc) ENCAPS="vc-encaps" ;;
-		*) ENCAPS="llc-encaps" ;;
+		1|vc) encaps="vc-encaps" ;;
+		*) encaps="llc-encaps" ;;
 	esac
 
+	local mtu
 	config_get mtu "$config" mtu
 	mtu=${mtu:-1500}
+
 	start_pppd "$config" \
-		plugin pppoatm.so ${vpi:-8}.${vci:-35} ${ENCAPS} \
+		plugin pppoatm.so ${vpi:-8}.${vci:-35} ${encaps} \
 		mtu $mtu mru $mtu
 }