mtd: nand: NULL terminate a of_device_id table

of_device_id tables should be NULL terminated.

Fixes: 07b23e3db9ed ("mtd: nand: Cleanup/rework the atmel_nand driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/atmel/nand-controller.c

@@ -1635,6 +1635,7 @@ static const struct of_device_id atmel_matrix_of_ids[] = {
 		.compatible = "atmel,at91sam9x5-matrix",
 		.data = (void *)AT91SAM9X5_MATRIX_EBICSA,
 	},
+	{ /* sentinel */ },
 };
 
 static int atmel_nand_controller_init(struct atmel_nand_controller *nc,