[NETFILTER]: x_tables: fix xt_register_table error propagation

When xt_register_table fails the error is not properly propagated back.
Based on patch by Lepton Wu <ytht.net@gmail.com>.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 2e72f89..0b5bd55 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1281,7 +1281,8 @@
 		return ret;
 	}
 
-	if (xt_register_table(table, &bootstrap, newinfo) != 0) {
+	ret = xt_register_table(table, &bootstrap, newinfo);
+	if (ret != 0) {
 		xt_free_table_info(newinfo);
 		return ret;
 	}