RIOT-OS/RIOT — pull request #2232 by cgundogan (2014-12-26 12:17:37+00:00)
Title: rpl: wrong offset for dao-ack receive buffer

Every other buffer is using the offset `IPV6_HDR_LEN + x`.
Even the send buffer for dao-acks.
Adding another `LL_HDR_LEN` to the dao-ack's recv buffer offset
seems obsolete and faulty.