Replace NULL with nullptr or null in webrtc/audio/ and common_audio/.
BUG=webrtc:7147
Review-Url: https://codereview.webrtc.org/2719733002
Cr-Original-Commit-Position: refs/heads/master@{#16843}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 922246a353acff8445d4b104f0271befff2bfa68
diff --git a/common_audio/vad/vad_core.h b/common_audio/vad/vad_core.h
index b38c515..0a76d96 100644
--- a/common_audio/vad/vad_core.h
+++ b/common_audio/vad/vad_core.h
@@ -60,7 +60,7 @@
//
// - self [i/o] : Instance that should be initialized
//
-// returns : 0 (OK), -1 (NULL pointer in or if the default mode can't be
+// returns : 0 (OK), -1 (null pointer in or if the default mode can't be
// set)
int WebRtcVad_InitCore(VadInstT* self);
