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simplified smpte check
simplified smpte check

--- a/ext/midi/midi_file.c

+++ b/ext/midi/midi_file.c

@@ -158,7 +158,7 @@

   mf->ntracks = (unsigned) mthd[11];

   mf->ntracks += (unsigned int) (mthd[10]) << 16;

   /** \bug: smpte timing not yet implemented */ 

-  if((int)(mthd[12]) < 0){

+  if(!mthd[12]){

   /*if((mthd[12]) < 0){*/

     mf->uses_smpte = 1;

     mf->smpte_fps = -mthd[12];