fixed 2 possible heap overflows (inc. #1088)
GF_Box *elng_New()
{
	ISOM_DECL_BOX_ALLOC(GF_MediaBox, GF_ISOM_BOX_TYPE_ELNG);
	return (GF_Box *)tmp;
}

GF_Box *elng_New()
{
	ISOM_DECL_BOX_ALLOC(GF_MediaBox, GF_ISOM_BOX_TYPE_ELNG);
	return (GF_Box *)tmp;
}
