fix [2324665] texture leak in surfaceflinger when using camera

LayerBuffer::BufferSource::~BufferSource()

{    

    class MessageDestroyTexture : public MessageBase {

        SurfaceFlinger* flinger;

        GLuint name;

    public:

        MessageDestroyTexture(

                SurfaceFlinger* flinger, GLuint name)

            : flinger(flinger), name(name) { }

        virtual bool handler() {

            glDeleteTextures(1, &name);

            return true;

        }

    };

    if (mTexture.name != -1U) {

        glDeleteTextures(1, &mTexture.name);

        // GL textures can only be destroyed from the GL thread

        mLayer.mFlinger->mEventQueue.postMessage(

                new MessageDestroyTexture(mLayer.mFlinger.get(), mTexture.name) );

    }

    if (mTexture.image != EGL_NO_IMAGE_KHR) {

        EGLDisplay dpy(mLayer.mFlinger->graphicPlane(0).getEGLDisplay());