mtd: nand: pxa3xx: Clear cmd buffer #3 (NDCB3) on command start

Command buffer #3 is not properly cleared and it keeps the last
set value. Fix this by clearing when a command is setup.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/pxa3xx_nand.c

@@ -602,6 +602,7 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command,
 	info->use_ecc		= 0;
 	info->use_spare		= 1;
 	info->retcode		= ERR_NONE;
+	info->ndcb3		= 0;
 	if (info->cs != 0)
 		info->ndcb0 = NDCB0_CSEL;
 	else
@@ -623,7 +624,6 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command,
 	default:
 		info->ndcb1 = 0;
 		info->ndcb2 = 0;
-		info->ndcb3 = 0;
 		break;
 	}