Miscellaneous changes split from https://codereview.webrtc.org/1230503003 .

webrtc/modules/audio_coding/codecs/isac/main/test/ReleaseTest-API/ReleaseTest-API.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 644 matching lines @@
             numTransCodingBytes += streamLenTransCoding;
           }
         }
       } else {
         break;
       }
 
       if (stream_len < 0) {
         /* exit if returned with error */
         errtype = WebRtcIsac_GetErrorCode(ISAC_main_inst);
-        printf("\n\nError in encoder: %d.\n\n", errtype);
+        fprintf(stderr, "Error in encoder: %d.\n", errtype);
         cout << flush;
+        exit(0);
       }
       cur_framesmpls += samplesIn10Ms;
       /* exit encoder loop if the encoder returned a bitstream */
       if (stream_len != 0)
         break;
     }
 
     /* read next bottleneck rate */
     if (f_bn != NULL) {
       if (fscanf(f_bn, "%d", &bottleneck) == EOF) {
@@ skipping 256 matching lines @@
     fprintf(stderr, "  transcoding rate %.0f kbps",
             (double)numTransCodingBytes * 8.0 * (sampFreqKHz) / totalsmpls);
   }
 
   fclose(inp);
   fclose(outp);
   WebRtcIsac_Free(ISAC_main_inst);
 
   exit(0);
 }