netfilter: xtables: provide invoked family value to extensions

By passing in the family through which extensions were invoked, a bit
of data space can be reclaimed. The "family" member will be added to
the parameter structures and the check functions be adjusted.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/sched/act_ipt.c

@@ -55,9 +55,9 @@ static int ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int
 	par.target    = target;
 	par.targinfo  = t->data;
 	par.hook_mask = hook;
+	par.family    = NFPROTO_IPV4;
 
-	ret = xt_check_target(&par, NFPROTO_IPV4,
-	      t->u.target_size - sizeof(*t), 0, false);
+	ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
 	if (ret < 0) {
 		module_put(t->u.kernel.target->me);
 		return ret;