mod: remove duplicate lines from ext_name output, by cuma.

On my 7390 05.50, the /var/tmp/ddnsstat.txt shows 2 lines:
root@fritz:/var/mod/root# cat /var/tmp/ddnsstat.txt 
5 (complete) 0 110 0 whatever.homelinux.org
98 (internet-not-connected) 0 0 1 whatever.homelinux.org

My 7170 just shows one line:
root@fritz:/var/mod/root# cat /var/tmp/ddnsstat.txt 
5 211935 whatever.homelinux.org

Remove duplicate lines so that the public hostname is shown in the GUI correctly.



git-svn-id: file:///var/svn/freetz/trunk@10336 149334a1-2f27-0410-a3b9-fc62619ac1e6