zebra: rtadv uses uninited data to sendmsg

valgrind is complaining about this problem.
This fixes it.

Signed-off-by: Donald Sharp <[email protected]>

zebra/rtadv.c

@@ -184,13 +184,13 @@ static int rtadv_recv_packet(struct zebra_vrf *zvrf, int sock, uint8_t *buf,
 static void rtadv_send_packet(int sock, struct interface *ifp,
 			      enum ipv6_nd_suppress_ra_status stop)
 {
-	struct msghdr msg;
-	struct iovec iov;
+	struct msghdr msg = { 0 };
+	struct iovec iov = { 0 };
 	struct cmsghdr *cmsgptr;
 	struct in6_pktinfo *pkt;
-	struct sockaddr_in6 addr;
-	unsigned char buf[RTADV_MSG_SIZE];
-	char adata[RTADV_ADATA_SIZE];
+	struct sockaddr_in6 addr = { 0 };
+	unsigned char buf[RTADV_MSG_SIZE] = { 0 };
+	char adata[RTADV_ADATA_SIZE] = { 0 };
 
 	struct nd_router_advert *rtadv;
 	int ret;