dhcp-pool: count only active leases, not free ones

Lease can be within time limits, but freed. Don't count them.

plugins/dhcp/dhcp-pool

@@ -160,6 +160,8 @@ sub determine_active_leases {
 	}
 	elsif ($line =~ /ends \d ([\d]{4})\/([\d]{2})\/([\d]{2}) ([\d]{2}):([\d]{2}):([\d]{2})/) {
 	    $enddate = mktime($6, $5, $4, $3, $2-1, $1-1900, 0, 0);
+	}
+	elsif ($line =~ /binding state active/) {
 	    if (defined($enddate) && defined($startdate) && defined($lease)) {
 		if ($startdate < time() && $enddate > time()) {
 		    push (@activeleases, $lease);