hwmon: Remove redundant spi driver bus initialization

In ancient times it was necessary to manually initialize the bus field of an
spi_driver to spi_bus_type. These days this is done in spi_register_driver(),
so we can drop the manual assignment.

The patch was generated using the following coccinelle semantic patch:
// <smpl>
@@
identifier _driver;
@@
struct spi_driver _driver = {
	.driver = {
-		.bus = &spi_bus_type,
	},
};
// </smpl>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: lm-sensors@lm-sensors.org
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

drivers/hwmon/ad7314.c

@@ -160,7 +160,6 @@ MODULE_DEVICE_TABLE(spi, ad7314_id);
 static struct spi_driver ad7314_driver = {
 	.driver = {
 		.name = "ad7314",
-		.bus = &spi_bus_type,
 		.owner = THIS_MODULE,
 	},
 	.probe = ad7314_probe,

drivers/hwmon/ads7871.c

@@ -227,7 +227,6 @@ static int __devexit ads7871_remove(struct spi_device *spi)
 static struct spi_driver ads7871_driver = {
 	.driver = {
 		.name = DEVICE_NAME,
-		.bus = &spi_bus_type,
 		.owner = THIS_MODULE,
 	},