Earlier, CHECK_GL_ERROR() always called OpenGLHelper::checkGLError().
That function looks up the OpenGL error status using glGetError(),
which might be a not so light-weight operation, and outputs error
information using SAL_WARN(). In a production build where SAL_WARN()
is a no-op anyway, that is fairly pointless.

Change-Id: I2d044bff6128a8ac7739020f8e414d7d3615e8d5