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src/tempo/beattracking.c: avoid segfault on silence (closes #24)

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

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

@@ -266,6 +266,7 @@

 {

   sint_t k = 0;

   smpl_t three_energy = 0., four_energy = 0.;

+  if (gp < 2) return 4;

   if (acflen > 6 * gp + 2) {

     for (k = -2; k < 2; k++) {

       three_energy += acf->data[3 * gp + k];