cmMidi.c : Removed check for negative on unsigned 'rv' in cmSciPitchToMidi().

cmMidi.c

 
   unsigned rv =  (octave*12) + idx + 12;
   
-  if( 0 <= rv && rv <= 127 )
+  if( rv <= 127 )
     return rv;
 
   return kInvalidMidiPitch;