libceph: minor byte order problems in read_partial_message()

Some values printed are not (necessarily) in CPU order.  We already
have a copy of the converted versions, so use them.
Signed-off-by: NAlex Elder <elder@inktank.com>
Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>

net/ceph/messenger.c

@@ -1916,7 +1916,7 @@ static int read_partial_message(struct ceph_connection *con)
 		int skip = 0;
 
 		dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
-		     con->in_hdr.front_len, con->in_hdr.data_len);
+		     front_len, data_len);
 		ret = ceph_con_in_msg_alloc(con, &skip);
 		if (ret < 0)
 			return ret;