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udhcpc doesn't send a hostname by default. Use the system hostname if nothing else is specified, to always send a hostname. It syncs the behaviour to odhcpc, which always sends a hostname. Signed-off-by: Mathias Kresin <dev@kresin.me> Acked-by: Stijn Tintel <stijn@linux-ipv6.be> Acked-by: Hans Dedecker <dedeckeh@gmail.com>