Massively reduce CPU when Readers are blocked on unavailable data

reader.go

@@ -98,7 +98,6 @@ func (r *Reader) tickleClient() {
 func (r *Reader) waitReadable(off int64) {
 	// We may have been sent back here because we were told we could read but
 	// it failed.
-	r.tickleClient()
 	r.t.cl.event.Wait()
 }
 

t.go

@@ -36,7 +36,6 @@ func (t *Torrent) NewReader() (ret *Reader) {
 		t:         t,
 		readahead: 5 * 1024 * 1024,
 	}
-	ret.pieces = ret.piecesUncached()
 	t.addReader(ret)
 	return
 }