SDL_n3dsaudio.c: separate mixer locks from audio device locks

src/audio/n3ds/SDL_n3dsaudio.c

@@ -38,6 +38,7 @@ static SDL_AudioDevice *audio_device;
 static void FreePrivateData(_THIS);
 static int FindAudioFormat(_THIS);
 
+/* fully local functions related to the wavebufs / DSP, not the same as the SDL-wide mixer lock */
 static SDL_INLINE void contextLock(_THIS)
 {
     LightLock_Lock(&this->hidden->lock);
@@ -48,16 +49,6 @@ static SDL_INLINE void contextUnlock(_THIS)
     LightLock_Unlock(&this->hidden->lock);
 }
 
-static void N3DSAUD_LockAudio(_THIS)
-{
-    contextLock(this);
-}
-
-static void N3DSAUD_UnlockAudio(_THIS)
-{
-    contextUnlock(this);
-}
-
 static void N3DSAUD_DspHook(DSP_HookType hook)
 {
     if (hook == DSPHOOK_ONCANCEL) {
@@ -195,6 +186,7 @@ static void N3DSAUDIO_PlayDevice(_THIS)
 {
     size_t nextbuf;
     size_t sampleLen;
+
     contextLock(this);
 
     nextbuf = this->hidden->nextbuf;
@@ -271,8 +263,6 @@ static SDL_bool N3DSAUDIO_Init(SDL_AudioDriverImpl *impl)
     impl->GetDeviceBuf = N3DSAUDIO_GetDeviceBuf;
     impl->CloseDevice = N3DSAUDIO_CloseDevice;
     impl->ThreadInit = N3DSAUDIO_ThreadInit;
-    impl->LockDevice = N3DSAUD_LockAudio;
-    impl->UnlockDevice = N3DSAUD_UnlockAudio;
     impl->OnlyHasDefaultOutputDevice = SDL_TRUE;
 
     /* Should be possible, but micInit would fail */