Fixed bugs due to uninitialized data in the JP2 decoder.
Also, added some comments marking I/O stream interfaces that probably
need to be changed (in the long term) to fix integer overflow problems.
static void jp2_pclr_destroy(jp2_box_t *box)
{
	jp2_pclr_t *pclr = &box->data.pclr;
	if (pclr->lutdata) {
		jas_free(pclr->lutdata);
	}
	if (pclr->bpc)
		jas_free(pclr->bpc);
}

static void jp2_pclr_destroy(jp2_box_t *box)
{
	jp2_pclr_t *pclr = &box->data.pclr;
	if (pclr->lutdata) {
		jas_free(pclr->lutdata);
	}
	if (pclr->bpc)
		jas_free(pclr->bpc);
}
