Switch usage of _DEBUG macro to NDEBUG.

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

Index: webrtc/modules/audio_coding/codecs/isac/main/test/ReleaseTest-API/ReleaseTest-API.cc
diff --git a/webrtc/modules/audio_coding/codecs/isac/main/test/ReleaseTest-API/ReleaseTest-API.cc b/webrtc/modules/audio_coding/codecs/isac/main/test/ReleaseTest-API/ReleaseTest-API.cc
index 2e5badd82ceba870e32b980ed4abb66c1beb27f9..4cef8f7b3b9e92bf03e5a4970b090a3809289f0e 100644
--- a/webrtc/modules/audio_coding/codecs/isac/main/test/ReleaseTest-API/ReleaseTest-API.cc
+++ b/webrtc/modules/audio_coding/codecs/isac/main/test/ReleaseTest-API/ReleaseTest-API.cc
@@ -73,10 +73,10 @@ int main(int argc, char* argv[]) {
   FILE* plFile;
   int32_t sendBN;
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
   FILE* fy;
   double kbps;
-#endif /* _DEBUG */
+#endif
   size_t totalbits = 0;
   int totalsmpls = 0;
 
@@ -103,12 +103,12 @@ int main(int argc, char* argv[]) {
 
   BottleNeckModel BN_data;
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
   fy = fopen("bit_rate.dat", "w");
   fclose(fy);
   fy = fopen("bytes_frames.dat", "w");
   fclose(fy);
-#endif /* _DEBUG */
+#endif
 
   /* Handling wrong input arguments in the command line */
   if ((argc < 3) || (argc > 17)) {
@@ -885,14 +885,14 @@ int main(int argc, char* argv[]) {
 
     totalsmpls += declen;
     totalbits += 8 * stream_len;
-#ifdef _DEBUG
+#if !defined(NDEBUG)
     kbps = ((double)sampFreqKHz * 1000.) / ((double)cur_framesmpls) * 8.0 *
            stream_len / 1000.0;  // kbits/s
     fy = fopen("bit_rate.dat", "a");
     fprintf(fy, "Frame %i = %0.14f\n", framecnt, kbps);
     fclose(fy);
 
-#endif /* _DEBUG */
+#endif
   }
   printf("\n");
   printf("total bits               = %" PRIuS " bits\n", totalbits);