warnings be gone.

Change-Id: Ie3bae3f037730e316d7fca12e7a3527973f752ef
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
index 817395a..01e59c8 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
@@ -1528,7 +1528,7 @@
     notify->post();
 }
 
-void NuPlayer::Source::onMessageReceived(const sp<AMessage> &msg) {
+void NuPlayer::Source::onMessageReceived(const sp<AMessage> & /* msg */) {
     TRESPASS();
 }