spi/dw_spi: mmio code style fixups

Minor code style cleanups following comments by Wolfram Sang
Signed-off-by: Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/spi/dw_spi_mmio.c

@@ -134,13 +134,12 @@ static int __init dw_spi_mmio_init(void)
 {
 	return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
 }
+module_init(dw_spi_mmio_init);
 
 static void __exit dw_spi_mmio_exit(void)
 {
 	platform_driver_unregister(&dw_spi_mmio_driver);
 }
-
-module_init(dw_spi_mmio_init);
 module_exit(dw_spi_mmio_exit);
 
 MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");