emulator Opengl - number of supported vertex attributes

make the number of suppoted vertex attributes (by the codec)
common across the encoder and the decoder.

Change-Id: I699ef62821566cec0764982872adb92ebb8861e9

tools/emulator/opengl/shared/OpenglCodecCommon/FixedBuffer.h

@@ -25,10 +25,8 @@ public:
     }
 
     ~FixedBuffer() {
-        if (m_buffer != NULL) {
-            delete m_buffer;
-            m_bufferLen = 0;
-        }
+        delete m_buffer;
+        m_bufferLen = 0;
     }
 
     void * alloc(size_t size) {