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opus_demo: fixes potential division by zero on files with no active frame

--- a/src/opus_demo.c

+++ b/src/opus_demo.c

@@ -866,7 +866,7 @@

                      1e-3*bits_max*sampling_rate/frame_size);

     if (!decode_only)

        fprintf (stderr, "active bitrate:              %7.3f kb/s\n",

-               1e-3*bits_act*sampling_rate/(frame_size*(double)count_act));

+               1e-3*bits_act*sampling_rate/(1e-15+frame_size*(double)count_act));

     fprintf (stderr, "bitrate standard deviation:  %7.3f kb/s\n",

             1e-3*sqrt(bits2/count - bits*bits/(count*(double)count))*sampling_rate/frame_size);

     /* Close any files to which intermediate results were stored */