EmuGL: misc small cleanups

* Disable verbose debug spam.
* Add missing GL enum to utility function. The default case was
  returning the correct size, so this doesn't fix any bugs, just
  removes some logcat spam.
* Comment and whitespace corrections.

Change-Id: I83fb8644331ae1072d6a8dae9c041da92073089f

tools/emulator/opengl/host/libs/libOpenglRender/RenderThread.cpp

@@ -78,7 +78,6 @@ int RenderThread::Main()
 
         int stat = readBuf.getData();
         if (stat <= 0) {
-            fprintf(stderr, "client shutdown\n");
             break;
         }