mtd: nand: set ECC algorithm to Hamming on fallback

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 9f157bb..2a04957 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4337,6 +4337,7 @@
 		pr_warn("%d byte HW ECC not possible on %d byte page size, fallback to SW ECC\n",
 			ecc->size, mtd->writesize);
 		ecc->mode = NAND_ECC_SOFT;
+		ecc->algo = NAND_ECC_HAMMING;
 
 	case NAND_ECC_SOFT:
 		ecc->calculate = nand_calculate_ecc;