Get a test failing to test the buildbots.

gtests/net/packetdrill/checksum_test.c

@@ -42,7 +42,7 @@ static void test_tcp_udp_v4_checksum(void)
 		0xa0, 0x12, 0x16, 0xa0, 0x54, 0x12, 0x00, 0x00,
 		0x02, 0x04, 0x05, 0xb4, 0x04, 0x02, 0x08, 0x0a,
 		0x00, 0x00, 0x02, 0xbc, 0x00, 0x06, 0x0a, 0xd8,
-		0x01, 0x03, 0x03, 0x07,
+		0x01, 0x03, 0x03, 0x06,
 	};
 
 	struct in_addr src_ip, dst_ip;