[gnome-network]IPV6 fix for scan

[William Jon McCann <mccannwj pha jhu edu>]

For some reason connect() always returns zero for IPV6 on my RedHat 9 
system configured to use IPV4.  This breaks the port scan function in 
gnome-netinfo.

Here is a patch that works around that and at the same time reduces the 
number of system calls.

Can someone please test this on a IPV6 system?

Let me know if this is ok to commit.

Thanks,
Jon