Input: gpio-keys - make gpio_keys_device_driver static

This fixes the sparse warning

	symbol 'gpio_keys_device_driver' was not declared. Should it be static?

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 1a92f4b..3f48279 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -257,7 +257,7 @@
 #define gpio_keys_resume	NULL
 #endif
 
-struct platform_driver gpio_keys_device_driver = {
+static struct platform_driver gpio_keys_device_driver = {
 	.probe		= gpio_keys_probe,
 	.remove		= __devexit_p(gpio_keys_remove),
 	.suspend	= gpio_keys_suspend,