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src/tempo/beattracking.c: do nothing if period is zero

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

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

@@ -182,6 +182,10 @@

   bp = bt->bp;

   /* end of biased filterbank */

+  if (bp == 0) {

+    output->data[0] = 0;

+    return;

+  }

   /* deliberate integer operation, could be set to 3 max eventually */

   kmax = FLOOR (winlen / bp);

@@ -381,7 +385,7 @@

   /* do some further checks on the final bp value */

   /* if tempo is > 206 bpm, half it */

-  while (bp < 25) {

+  while (0 < bp && bp < 25) {

 #if AUBIO_BEAT_WARNINGS

     AUBIO_WRN ("doubling from %f (%f bpm) to %f (%f bpm)\n",

         bp, 60.*44100./512./bp, bp/2., 60.*44100./512./bp/2. );