vrrpd: iterate over all ancillary messages

Assign the return of `CMSG_NXTHDR` so we can really iterate over the
ancillary data.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>
(cherry picked from commit 5e1a3cd2ad1148f60f5a59474bcf3d176b9ab789)

diff --git a/vrrpd/vrrp_packet.c b/vrrpd/vrrp_packet.c
index 36494c7df8b704ed536277ee281f0049aa2d3dcf..a2fb2bc321434c771665317834f841937e0bb5cb 100644 (file)
--- a/vrrpd/vrrp_packet.c
+++ b/vrrpd/vrrp_packet.c
@@ -234,7 +234,7 @@ ssize_t vrrp_pkt_parse_datagram(int family, int version, bool ipv4_ph,
        } else if (family == AF_INET6) {
                struct cmsghdr *c;
 
-               for (c = CMSG_FIRSTHDR(m); c != NULL; CMSG_NXTHDR(m, c)) {
+               for (c = CMSG_FIRSTHDR(m); c != NULL; c = CMSG_NXTHDR(m, c)) {
                        if (c->cmsg_level == IPPROTO_IPV6
                            && c->cmsg_type == IPV6_HOPLIMIT)
                                break;