net: encx24j600: Fix SPI id table definition

A driver's SPI id table is expected to be an array of struct spi_device_id
that ends with a zero-initialized sentinel entry. But this driver defines
the table as a single struct spi_device_id and sets .id_table to a pointer
to this struct.

But spi_match_id() has a loop that iterates while the struct spi_device_id
.name[0] is not NULL, so not having a sentinel can cause a NULL pointer
deference error.

This patch defines the SPI id table correctly as all other SPI drivers do.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/encx24j600.c

@@ -1094,8 +1094,9 @@ static int encx24j600_spi_remove(struct spi_device *spi)
 	return 0;
 }
 
-static const struct spi_device_id encx24j600_spi_id_table = {
-	.name = "encx24j600"
+static const struct spi_device_id encx24j600_spi_id_table[] = {
+	{ .name = "encx24j600" },
+	{ /* sentinel */ }
 };
 
 static struct spi_driver encx24j600_spi_net_driver = {
@@ -1106,7 +1107,7 @@ static struct spi_driver encx24j600_spi_net_driver = {
 	},
 	.probe		= encx24j600_spi_probe,
 	.remove		= encx24j600_spi_remove,
-	.id_table	= &encx24j600_spi_id_table,
+	.id_table	= encx24j600_spi_id_table,
 };
 
 static int __init encx24j600_init(void)