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src/tempo/beattracking.c: fix rayleigh period clamping

--- a/src/tempo/beattracking.c

+++ b/src/tempo/beattracking.c

@@ -170,9 +170,11 @@

   /* find non-zero Rayleigh period */

   maxindex = fvec_max_elem (bt->acfout);

-  bt->rp = maxindex ? fvec_quadratic_peak_pos (bt->acfout, maxindex) : 1;

-  //rp = (maxindex==127) ? 43 : maxindex; //rayparam

-  bt->rp = (maxindex == bt->acfout->length - 1) ? bt->rayparam : maxindex;      //rayparam

+  if (maxindex > 0 && maxindex < bt->acfout->length - 1) {

+    bt->rp = fvec_quadratic_peak_pos (bt->acfout, maxindex);

+  } else {

+    bt->rp = bt->rayparam;

+  }

   /* activate biased filterbank */

   aubio_beattracking_checkstate (bt);