packet: make packet too small warning match condition

The expression in ll_header_truncated() tests less than or equal, but
the warning prints less than. Update the warning.
Reported-by: NJouni Malinen <jkmalinen@gmail.com>
Signed-off-by: NWillem de Bruijn <willemb@google.com>
Acked-by: NDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/packet/af_packet.c

@@ -2102,7 +2102,7 @@ static bool ll_header_truncated(const struct net_device *dev, int len)
 {
 	/* net device doesn't like empty head */
 	if (unlikely(len <= dev->hard_header_len)) {
-		net_warn_ratelimited("%s: packet size is too short (%d < %d)\n",
+		net_warn_ratelimited("%s: packet size is too short (%d <= %d)\n",
 				     current->comm, len, dev->hard_header_len);
 		return true;
 	}