linux-phytec-ti

netlink: implement unbind to netlink_setsockopt NETLINK_DROP_MEMBERSHIP

Call the per-protocol unbind function rather than bind function on
NETLINK_DROP_MEMBERSHIP in netlink_setsockopt().

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>