equal_freq() and compare_freq()

[Jakson A. Aquino]

Hello!

The functions equal_freq() and compare_freq() were causing segmentation
fault when there were more than 60 classes of frequency. Bug fixed:

    if(nclass > MCLASS){
      out_err(MAT, ERR_FILE, ERR_LINE, 
          _("Test aborted: There are more than %i classes of frequency.\n"),
          MCLASS);
      return;
    }

Best,

Jakson

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