fixed 2 possible heap overflows (inc. #1088)
GF_Box *tmin_New()
{
	ISOM_DECL_BOX_ALLOC(GF_TMINBox, GF_ISOM_BOX_TYPE_TMIN);
	return (GF_Box *)tmp;
}

GF_Box *tmin_New()
{
	ISOM_DECL_BOX_ALLOC(GF_TMINBox, GF_ISOM_BOX_TYPE_TMIN);
	return (GF_Box *)tmp;
}
