mtd: nand: plat_nand: return error code of nand_scan() on error

The nand_scan() returns an appropriate error value when it fails.
Use it instead of the fixed error code -ENXIO.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: NMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/plat_nand.c

@@ -86,10 +86,9 @@ static int plat_nand_probe(struct platform_device *pdev)
 	}
 
 	/* Scan to find existence of the device */
-	if (nand_scan(mtd, pdata->chip.nr_chips)) {
-		err = -ENXIO;
+	err = nand_scan(mtd, pdata->chip.nr_chips);
+	if (err)
 		goto out;
-	}
 
 	part_types = pdata->chip.part_probe_types;