- Removed unused argument (nhoff) for ipv6_parse_hopopts().
- Make ipv6_parse_hopopts() to align with other extension header
  handlers.
- Removed pointless assignment (hdr), which is not used afterwards.
Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>