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examples/utils.c: exit if an output file could not be opened

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -209,6 +209,10 @@

     samplerate = aubio_source_get_samplerate(this_source);

     if (sink_uri != NULL) {

       this_sink = new_aubio_sink ((char_t*)sink_uri, samplerate);

+      if (this_sink == NULL) {

+        outmsg ("Could not open output file %s.\n", sink_uri);

+        exit (1);

+      }

     }

   }

 #ifdef HAVE_LASH