[NETFILTER]: fix compat_nf_sockopt typo

It should pass opt to the ->get/->set functions, not ops.

Tested-by: Luca Tettamanti <kronos.it@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>