sendmsg returns a signed value, fix error check

ok millert@ deraadt@

diff --git a/usr.sbin/rtadvd/rtadvd.c b/usr.sbin/rtadvd/rtadvd.c
index aba081a..57d36ff 100644 (file)
--- a/usr.sbin/rtadvd/rtadvd.c
+++ b/usr.sbin/rtadvd/rtadvd.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: rtadvd.c,v 1.83 2017/01/20 23:29:58 benno Exp $       */
+/*     $OpenBSD: rtadvd.c,v 1.84 2017/04/05 14:48:48 jca Exp $ */
 /*     $KAME: rtadvd.c,v 1.66 2002/05/29 14:18:36 itojun Exp $ */
 
 /*
@@ -1218,7 +1218,7 @@ ra_output(struct rainfo *rainfo)
 {
        struct cmsghdr *cm;
        struct in6_pktinfo *pi;
-       size_t len;
+       ssize_t len;
 
        if ((iflist[rainfo->ifindex]->ifm_flags & IFF_UP) == 0) {
                log_debug("%s is not up, skip sending RA", rainfo->ifname);