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src/mathutils.c: freqtomidi and miditofreq to not produce infs and nans

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -398,6 +398,7 @@

 smpl_t

 aubio_freqtomidi (smpl_t freq)

 {

+  if (freq < 2. || freq > 100000.) return 0.; // avoid nans and infs

   /* log(freq/A-2)/log(2) */

   smpl_t midi = freq / 6.875;

   midi = LOG (midi) / 0.69314718055995;

@@ -409,6 +410,7 @@

 smpl_t

 aubio_miditofreq (smpl_t midi)

 {

+  if (midi > 140.) return 0.; // avoid infs

   smpl_t freq = (midi + 3.) / 12.;

   freq = EXP (freq * 0.69314718055995);

   freq *= 6.875;