odd-fw patch

I once (twice) got trouble with odd routers. An old NEC router would show local and global IPs in a page, and ddclient reported the local one while ISP was about to reassign global IP. Another was a crazy Buffalo's router, which would show global IP padded with zero like 061.020.001.010 in the status page. Note that I utilized this patch on ddclient 3.7.1 myself, but now I can't reproduce the odd behavior because those crazy routers are already gone.