MISC: convert drivers/misc/* to use module_spi_driver()

This patch converts the drivers in drivers/misc/* to use the
module_spi_driver() macro which makes the code smaller and a bit
simpler.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Cc: Michael Hennerich <hennerich@blackfin.uclinux.org>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Daniel Mack <zonque@gmail.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/misc/ad525x_dpot-spi.c b/drivers/misc/ad525x_dpot-spi.c
index 822749e..f623175 100644
--- a/drivers/misc/ad525x_dpot-spi.c
+++ b/drivers/misc/ad525x_dpot-spi.c
@@ -135,17 +135,7 @@
 	.id_table	= ad_dpot_spi_id,
 };
 
-static int __init ad_dpot_spi_init(void)
-{
-	return spi_register_driver(&ad_dpot_spi_driver);
-}
-module_init(ad_dpot_spi_init);
-
-static void __exit ad_dpot_spi_exit(void)
-{
-	spi_unregister_driver(&ad_dpot_spi_driver);
-}
-module_exit(ad_dpot_spi_exit);
+module_spi_driver(ad_dpot_spi_driver);
 
 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 MODULE_DESCRIPTION("digital potentiometer SPI bus driver");