[PATCH] Allow the USB device to be a symlink to a device node

[Ignacio Vazquez-Abrams]

The attached patch allows the USB device passed to livecd-iso-to-disk to
be specified as a symlink, e.g., /dev/disk/by-*/*.

-- 
Ignacio Vazquez-Abrams <ivazqueznet(a)gmail.com&gt;

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