Frameworks/native: Fix unused parameter warning

Pulled in in hardware/, where -Werror is used.

Change-Id: I13fc31d31fe2f623d39c84862b0c95a28813723d
diff --git a/include/gui/IConsumerListener.h b/include/gui/IConsumerListener.h
index 2ef7c4d..3f39799 100644
--- a/include/gui/IConsumerListener.h
+++ b/include/gui/IConsumerListener.h
@@ -62,7 +62,7 @@
     //
     // This is called without any lock held and can be called concurrently
     // by multiple threads.
-    virtual void onFrameReplaced(const BufferItem& item) {} /* Asynchronous */
+    virtual void onFrameReplaced(const BufferItem& /* item */) {} /* Asynchronous */
 
     // onBuffersReleased is called to notify the buffer consumer that the
     // BufferQueue has released its references to one or more GraphicBuffers