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[awhitening] use shortest length available (closes gh-216)

--- a/src/spectral/awhitening.c

+++ b/src/spectral/awhitening.c

@@ -43,7 +43,8 @@

 aubio_spectral_whitening_do (aubio_spectral_whitening_t * o, cvec_t * fftgrain)

 {

   uint_t i = 0;

-  for (i = 0; i < o->peak_values->length; i++) {

+  uint_t length = MIN(fftgrain->length, o->peak_values->length);

+  for (i = 0; i < length; i++) {

     smpl_t tmp = MAX(o->r_decay * o->peak_values->data[i], o->floor);

     o->peak_values->data[i] = MAX(fftgrain->norm[i], tmp);

     fftgrain->norm[i] /= o->peak_values->data[i];