mtd: rawnand: cadence: fix incorrect device in dma_unmap_single

dma_map_single is using physical/bus device (DMA) but dma_unmap_single
is using framework device(NAND controller), which is incorrect.
Fixed dma_unmap_single to use correct physical/bus device.

Fixes: ec4ba01 ("mtd: rawnand: Add new Cadence NAND driver to MTD subsystem")
Cc: stable@vger.kernel.org
Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@intel.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Author: rabara

drivers/mtd/nand/raw/cadence-nand-controller.c

@@ -1863,12 +1863,12 @@ static int cadence_nand_slave_dma_transfer(struct cdns_nand_ctrl *cdns_ctrl,
 	dma_async_issue_pending(cdns_ctrl->dmac);
 	wait_for_completion(&finished);
 
-	dma_unmap_single(cdns_ctrl->dev, buf_dma, len, dir);
+	dma_unmap_single(dma_dev->dev, buf_dma, len, dir);
 
 	return 0;
 
 err_unmap:
-	dma_unmap_single(cdns_ctrl->dev, buf_dma, len, dir);
+	dma_unmap_single(dma_dev->dev, buf_dma, len, dir);
 
 err:
 	dev_dbg(cdns_ctrl->dev, "Fall back to CPU I/O\n");