Fixed missing return value from a method should have returned status_t

Change-Id: I83ad2735eaf8a8dfa5f8f29f30aec1311b3222de
diff --git a/include/media/stagefright/SurfaceMediaSource.h b/include/media/stagefright/SurfaceMediaSource.h
index 54baab6..936b057 100644
--- a/include/media/stagefright/SurfaceMediaSource.h
+++ b/include/media/stagefright/SurfaceMediaSource.h
@@ -111,7 +111,7 @@
     // Make sure this is called when the mutex is locked
     virtual status_t onFrameReceivedLocked();
 
-    virtual status_t setScalingMode(int mode) { } // no op for encoding
+    virtual status_t setScalingMode(int mode) { return OK; } // no op for encoding
     virtual int query(int what, int* value);
 
     // Just confirming to the ISurfaceTexture interface as of now