ipv6: propagate genlmsg_reply return code

genlmsg_reply can fail, so propagate its return code

Fixes: 915d7e5e59 ("ipv6: sr: add code base for control plane support of SR-IPv6")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/seg6.c

@@ -221,9 +221,7 @@ static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
 	rcu_read_unlock();
 
 	genlmsg_end(msg, hdr);
-	genlmsg_reply(msg, info);
+	return genlmsg_reply(msg, info);
-
-	return 0;
 
 nla_put_failure:
 	rcu_read_unlock();