wireless: 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_driver_register(),
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: Dan Williams <dcbw@redhat.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Christian Lamparter <chunkeey@googlemail.com>
Cc: Luciano Coelho <coelho@ti.com>
Cc: libertas-dev@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Acked-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/if_spi.c

@@ -1290,7 +1290,6 @@ static struct spi_driver libertas_spi_driver = {
 	.remove = __devexit_p(libertas_spi_remove),
 	.driver = {
 		.name	= "libertas_spi",
-		.bus	= &spi_bus_type,
 		.owner	= THIS_MODULE,
 		.pm	= &if_spi_pm_ops,
 	},

drivers/net/wireless/p54/p54spi.c

@@ -699,7 +699,6 @@ static int __devexit p54spi_remove(struct spi_device *spi)
 static struct spi_driver p54spi_driver = {
 	.driver = {
 		.name		= "p54spi",
-		.bus		= &spi_bus_type,
 		.owner		= THIS_MODULE,
 	},
 

drivers/net/wireless/wl1251/spi.c

@@ -319,7 +319,6 @@ static int __devexit wl1251_spi_remove(struct spi_device *spi)
 static struct spi_driver wl1251_spi_driver = {
 	.driver = {
 		.name		= DRIVER_NAME,
-		.bus		= &spi_bus_type,
 		.owner		= THIS_MODULE,
 	},
 

drivers/net/wireless/wl12xx/spi.c

@@ -462,7 +462,6 @@ static int __devexit wl1271_remove(struct spi_device *spi)
 static struct spi_driver wl1271_spi_driver = {
 	.driver = {
 		.name		= "wl1271_spi",
-		.bus		= &spi_bus_type,
 		.owner		= THIS_MODULE,
 	},