[IPV4]: Remove unused ip_options->is_data.

ip_options->is_data is assigned only and never checked. The structure is
not a part of kernel interface to the userspace. So, it is safe to remove
this field.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/inet_sock.h
Simple merge

diff --cc net/ipv4/cipso_ipv4.c
Simple merge

diff --cc net/ipv4/ip_options.c
Simple merge