ipvs: Return negative error values from ip_vs_edit_service()

Like the other code in this function does.
Signed-off-by: NSven Wegener <sven.wegener@stealer.net>
Acked-by: NJulius Volz <juliusv@google.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>

net/ipv4/ipvs/ip_vs_ctl.c

@@ -1284,11 +1284,11 @@ ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
 #ifdef CONFIG_IP_VS_IPV6
 	if (u->af == AF_INET6) {
 		if (!sched->supports_ipv6) {
-			ret = EAFNOSUPPORT;
+			ret = -EAFNOSUPPORT;
 			goto out;
 		}
 		if ((u->netmask < 1) || (u->netmask > 128)) {
-			ret = EINVAL;
+			ret = -EINVAL;
 			goto out;
 		}
 	}