Fix C function to comply with improved -Wstrict-prototypes

Bug: b/229072413
Change-Id: Id02a4c92693858864fdadfafdbdd98ed78f1c83e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/258790
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Per Ã…hgren <peah@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36539}
diff --git a/common_audio/vad/webrtc_vad.c b/common_audio/vad/webrtc_vad.c
index 49e7682..6dd14d8 100644
--- a/common_audio/vad/webrtc_vad.c
+++ b/common_audio/vad/webrtc_vad.c
@@ -21,7 +21,7 @@
 static const size_t kRatesSize = sizeof(kValidRates) / sizeof(*kValidRates);
 static const int kMaxFrameLengthMs = 30;
 
-VadInst* WebRtcVad_Create() {
+VadInst* WebRtcVad_Create(void) {
   VadInstT* self = (VadInstT*)malloc(sizeof(VadInstT));
 
   self->init_flag = 0;