[package] pptp: don't remove server route if the gateway is 0.0.0.0, this fixes a problem when a pppoe peer is pptp server at the same time

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21393 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/pptp/files/pptp.sh

@@ -26,7 +26,7 @@ setup_interface_pptp() {
 	setup_interface "$device" "$config" "${ipproto:-dhcp}"
 	local gw="$(find_gw)"
 	[ -n "$gw" ] && {
-		route delete "$server" 2>/dev/null >/dev/null
+		[ "$gw" != 0.0.0.0 ] && route delete "$server" 2>/dev/null >/dev/null
 		route add "$server" gw "$gw"
 	}