Summary:
Even ehen COMP is cleared, the algorithm always elides part of the address when a matching
context is found.
This behviour occurs because in the line
if ((src_ctx != NULL) || ipv6_addr_is_link_local(&(ipv6_hdr->src)))
the COMP bit is not tested.
This patch fixes the problem by setting [src|dst]_ctx to NULL if the
context must not be used.
faa47a0e03