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src/mathutils.c: freqtobin and bintofreq to not produce negative values

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -421,7 +421,7 @@

 aubio_bintofreq (smpl_t bin, smpl_t samplerate, smpl_t fftsize)

 {

   smpl_t freq = samplerate / fftsize;

-  return freq * bin;

+  return freq * MAX(bin, 0);

 }

 smpl_t

@@ -435,7 +435,7 @@

 aubio_freqtobin (smpl_t freq, smpl_t samplerate, smpl_t fftsize)

 {

   smpl_t bin = fftsize / samplerate;

-  return freq * bin;

+  return MAX(freq, 0) * bin;

 }

 smpl_t