fix ifup for pppoa

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1803 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/default/sbin/ifup

@@ -8,6 +8,7 @@ type=$1
 debug "### ifup $type ###"
 
 if_proto=$(nvram get ${type}_proto)
+[ "${if_proto}" = "pppoa" ] || {
 	if=$(nvram get ${type}_ifname)
 	[ "${if%%[0-9]}" = "ppp" ] && if=$(nvram get ${if_proto}_ifname)
 
@@ -34,6 +35,7 @@ if [ "${if%%[0-9]}" = "br" ]; then
 	else
 		${mac:+$DEBUG ifconfig $if down hw ether $mac}
 	fi
+}
 
 case "$if_proto" in
 	static)