Refactor audio_processing: Free functions return void

There is no point in returning an error when Free() fails. In fact it can only happen if we have a null pointer as object. There is further no place where the return value is used.

Affected components are
- aec
- aecm
- agc
- ns

BUG=441
R=kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/50579004

Cr-Commit-Position: refs/heads/master@{#8966}

4 files changed, 8 insertions, 24 deletions

diff --git a/webrtc/modules/audio_processing/aecm/aecm_core.c b/webrtc/modules/audio_processing/aecm/aecm_core.c
index c95c1f2af5..6741acba14 100644
--- a/webrtc/modules/audio_processing/aecm/aecm_core.c
+++ b/webrtc/modules/audio_processing/aecm/aecm_core.c
@@ -546,10 +546,9 @@ int WebRtcAecm_Control(AecmCore* aecm, int delay, int nlpFlag) {
     return 0;
 }
 
-int WebRtcAecm_FreeCore(AecmCore* aecm) {
-    if (aecm == NULL)
-    {
-        return -1;
+void WebRtcAecm_FreeCore(AecmCore* aecm) {
+    if (aecm == NULL) {
+      return;
     }
 
     WebRtc_FreeBuffer(aecm->farFrameBuf);
@@ -562,8 +561,6 @@ int WebRtcAecm_FreeCore(AecmCore* aecm) {
     WebRtcSpl_FreeRealFFT(aecm->real_fft);
 
     free(aecm);
-
-    return 0;
 }
 
 int WebRtcAecm_ProcessFrame(AecmCore* aecm,
diff --git a/webrtc/modules/audio_processing/aecm/aecm_core.h b/webrtc/modules/audio_processing/aecm/aecm_core.h
index 03655b90c7..15614d67fa 100644
--- a/webrtc/modules/audio_processing/aecm/aecm_core.h
+++ b/webrtc/modules/audio_processing/aecm/aecm_core.h
@@ -174,11 +174,7 @@ int WebRtcAecm_InitCore(AecmCore* const aecm, int samplingFreq);
 // Input:
 //      - aecm          : Pointer to the AECM instance
 //
-// Return value         :  0 - Ok
-//                        -1 - Error
-//           11001-11016: Error
-//
-int WebRtcAecm_FreeCore(AecmCore* aecm);
+void WebRtcAecm_FreeCore(AecmCore* aecm);
 
 int WebRtcAecm_Control(AecmCore* aecm, int delay, int nlpFlag);
 
diff --git a/webrtc/modules/audio_processing/aecm/echo_control_mobile.c b/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
index 389433b8fd..2424839ac4 100644
--- a/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
+++ b/webrtc/modules/audio_processing/aecm/echo_control_mobile.c
@@ -130,13 +130,11 @@ int32_t WebRtcAecm_Create(void **aecmInst)
     return 0;
 }
 
-int32_t WebRtcAecm_Free(void *aecmInst)
-{
+void WebRtcAecm_Free(void* aecmInst) {
   AecMobile* aecm = aecmInst;
 
-    if (aecm == NULL)
-    {
-        return -1;
+    if (aecm == NULL) {
+      return;
     }
 
 #ifdef AEC_DEBUG
@@ -153,8 +151,6 @@ int32_t WebRtcAecm_Free(void *aecmInst)
     WebRtcAecm_FreeCore(aecm->aecmCore);
     WebRtc_FreeBuffer(aecm->farendBuf);
     free(aecm);
-
-    return 0;
 }
 
 int32_t WebRtcAecm_Init(void *aecmInst, int32_t sampFreq)
diff --git a/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h b/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h
index ac43576dd2..617c9602dc 100644
--- a/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h
+++ b/webrtc/modules/audio_processing/aecm/include/echo_control_mobile.h
@@ -61,13 +61,8 @@ int32_t WebRtcAecm_Create(void **aecmInst);
  * Inputs                       Description
  * -------------------------------------------------------------------
  * void*    aecmInst            Pointer to the AECM instance
- *
- * Outputs                      Description
- * -------------------------------------------------------------------
- * int32_t  return              0: OK
- *                             -1: error
  */
-int32_t WebRtcAecm_Free(void *aecmInst);
+void WebRtcAecm_Free(void* aecmInst);
 
 /*
  * Initializes an AECM instance.