libmediaplayerservice: unused argument warning messages

Change-Id: I7dbf62858114ac9b8de6d7b66cc00e002769a5cf
diff --git a/media/libmediaplayerservice/MetadataRetrieverClient.cpp b/media/libmediaplayerservice/MetadataRetrieverClient.cpp
index 5c9bd8f..063eb94 100644
--- a/media/libmediaplayerservice/MetadataRetrieverClient.cpp
+++ b/media/libmediaplayerservice/MetadataRetrieverClient.cpp
@@ -56,7 +56,7 @@
     disconnect();
 }
 
-status_t MetadataRetrieverClient::dump(int fd, const Vector<String16>& args) const
+status_t MetadataRetrieverClient::dump(int fd, const Vector<String16>& /*args*/) const
 {
     const size_t SIZE = 256;
     char buffer[SIZE];