ifdown issue.

[Rob Kramer]

On a new Yocto build (with busybox 1.29) I noticed that 'ifdown eth0' 
didn't work anymore, i.e. would just report:

     ifdown: interface eth0 not configured

My ifstate file typically has two entries:

     lo=lo

     eth0=eth0

The issue is that ifupdown.c only seems to read a single line in the 
ifstate file. I'm not familiar with the code, but it seems 
xmalloc_fgets() doesn't break at newlines, and as such the loop in 
read_iface_state() won't work.

If I change the code to use xmalloc_fgets_str(), it works as expectected 
(see attached patch).

I'm not sure if this is the correct way to fix my issue, especially 
since nobody has reported this yet :)

Cheers!

     Rob


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