patch for live-initramfs live-helpers get_mac()

[daniel at debian.org (Daniel Baumann)]

Jordi Pujol wrote:
> In the live_helpers script,
> get_mac() function must return Error when no mac is found,
> and Success otherwise

i don't think so. live (which is calling get_mac) is checking for an
empty mac already, and is correctly failing if it is the case (by using
panic(); ).

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