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test-beattracking.c: add call to aubio_beattracking_get_bpm, making sure it returns 0 on silent frames

--- a/examples/tests/test-beattracking.c

+++ b/examples/tests/test-beattracking.c

@@ -12,8 +12,15 @@

         uint_t i = 0;

+        smpl_t curtempo;

+

         while (i < 10) {

           aubio_beattracking_do(tempo,in,out);

+          curtempo = aubio_beattracking_get_bpm(tempo);

+          if (curtempo != 0.) {

+            fprintf(stdout,"%f\n",curtempo);

+            return 1;

+          }

           i++;

         };