Input: gpio_keys - remove redundant platform_set_drvdata()

Commit 0998d06310 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index b29ca65..440ce32 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -767,7 +767,6 @@
 	while (--i >= 0)
 		gpio_remove_key(&ddata->data[i]);
 
-	platform_set_drvdata(pdev, NULL);
  fail1:
 	input_free_device(input);
 	kfree(ddata);