remove unnecessary re-binding

sdl-opengl-vbo/sdl-opengl-vbo.cc

@@ -45,8 +45,6 @@ void display(void)
     GL_CHECK(glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indexes), indexes,
             GL_STATIC_DRAW));
 
-    GL_CHECK(glBindBuffer(GL_ARRAY_BUFFER, buffers[0]));
-    GL_CHECK(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]));
     GL_CHECK(glVertexPointer(3, GL_FLOAT, ADDR_DIFF(&data[0], &data[1]),
             (void *) ADDR_DIFF(&data, &data[0][0][0])));
     GL_CHECK(glColorPointer(4, GL_FLOAT, ADDR_DIFF(&data[0], &data[1]),