remove the data and conn fields from the Curl_transfer_keeper struct, they

weren't used anyway and mostly caused confusion

lib/transfer.c

@@ -960,7 +960,6 @@ CURLcode Curl_readwrite_init(struct connectdata *conn)
   k->now = k->start;   /* current time is now */
   k->header = TRUE; /* assume header */
   k->httpversion = -1; /* unknown at this point */
-  k->conn = (struct connectdata *)conn; /* store the connection */
 
   data = conn->data; /* there's the root struct */
   k->buf = data->state.buffer;

lib/urldata.h

@@ -248,9 +248,6 @@ struct Curl_transfer_keeper {
   long bodywrites;
   int writetype;
 
-  /* the highest fd we use + 1 */
-  struct SessionHandle *data;
-  struct connectdata *conn;
   char *buf;
   char *uploadbuf;
   int maxfd;