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In the function grub_net_ipv6_get_link_local(), grub_net_network_level_address_t addr is called but isn't being initialized. This results in the member grub_dns_option_t option being filled with junk data from the stack. We can prevent this by setting the option member in addr to 0. Fixes: CID 375033 Signed-off-by: Alec Brown <alec.r.brown@oracle.com> Reviewed-by: Darren Kenny <darren.kenny@oracle.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>