audio: fix unused param warnings

Change-Id: Ibd6b6cc1c76030997ec33a3a038ef664393b7aeb
diff --git a/visualizer/offload_visualizer.c b/visualizer/offload_visualizer.c
index 2f2bb14..e13f305 100644
--- a/visualizer/offload_visualizer.c
+++ b/visualizer/offload_visualizer.c
@@ -299,7 +299,7 @@
 }
 
 
-void *capture_thread_loop(void *arg)
+void *capture_thread_loop(void *arg __unused)
 {
     int16_t data[AUDIO_CAPTURE_PERIOD_SIZE * AUDIO_CAPTURE_CHANNEL_COUNT * sizeof(int16_t)];
     audio_buffer_t buf;
@@ -630,7 +630,7 @@
     return 0;
 }
 
-int visualizer_set_parameter(effect_context_t *context, effect_param_t *p, uint32_t size)
+int visualizer_set_parameter(effect_context_t *context, effect_param_t *p, uint32_t size __unused)
 {
     visualizer_context_t *visu_ctxt = (visualizer_context_t *)context;
 
@@ -763,8 +763,8 @@
     return 0;
 }
 
-int visualizer_command(effect_context_t * context, uint32_t cmdCode, uint32_t cmdSize,
-        void *pCmdData, uint32_t *replySize, void *pReplyData)
+int visualizer_command(effect_context_t * context, uint32_t cmdCode, uint32_t cmdSize __unused,
+        void *pCmdData __unused, uint32_t *replySize, void *pReplyData)
 {
     visualizer_context_t * visu_ctxt = (visualizer_context_t *)context;
 
@@ -886,7 +886,7 @@
  */
 
 int effect_lib_create(const effect_uuid_t *uuid,
-                         int32_t sessionId,
+                         int32_t sessionId __unused,
                          int32_t ioId,
                          effect_handle_t *pHandle) {
     int ret;
@@ -1003,8 +1003,8 @@
 
  /* Stub function for effect interface: never called for offloaded effects */
 int effect_process(effect_handle_t self,
-                       audio_buffer_t *inBuffer,
-                       audio_buffer_t *outBuffer)
+                       audio_buffer_t *inBuffer __unused,
+                       audio_buffer_t *outBuffer __unused)
 {
     effect_context_t * context = (effect_context_t *)self;
     int status = 0;