ovpnmain.cgi: Fix IP address calculation with static pools

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

config/rootfiles/core/190/filelists/files

@@ -3,5 +3,6 @@ etc/collectd.d
 etc/rc.d/init.d/collectd
 srv/web/ipfire/cgi-bin/index.cgi
 srv/web/ipfire/cgi-bin/logs.cgi/log.dat
+srv/web/ipfire/cgi-bin/ovpnmain.cgi
 srv/web/ipfire/cgi-bin/vpnmain.cgi
 var/ipfire/network-functions.pl

html/cgi-bin/ovpnmain.cgi

@@ -569,7 +569,7 @@ sub getccdadresses
 	for (my $i=1;$i<=$count;$i++) {
 		my $tmpip=$iprange[$i-1];
 		my $stepper=$i*4;
-		$iprange[$i]= &General::getnextip($tmpip,4);
+		$iprange[$i]= &Network::bin2ip(&Network::ip2bin($tmpip) + 4);
 	}
 	my $r=0;
 	foreach my $key (keys %ccdhash) {