Fix a sign warning.

diff --git a/arp.c b/arp.c
index 5188dce0af54c2c576cba27230d84fd37b31fba6..7b8ebbd52ba04113887ba6bfe3a1692598676c26 100644 (file)
--- a/arp.c
+++ b/arp.c
@@ -162,7 +162,8 @@ arp_packet(struct interface *ifp, uint8_t *data, size_t len)
 
        /* Ignore ARP Unicast Poll, RFC 1122 */
        if (arm.sip.s_addr == INADDR_ANY &&
-           (arm.tha[0] != 0 || memcmp(arm.tha, arm.tha + 1, ar.ar_hln - 1)))
+           (arm.tha[0] != 0 ||
+           memcmp(arm.tha, arm.tha + 1, (size_t)ar.ar_hln - 1)))
        {
 #ifdef ARP_DEBUG
                char buf[HWADDR_LEN * 3];