input: remove driver_data direct access of struct device

In the near future, the driver core is going to not allow direct access
to the driver_data pointer in struct device.  Instead, the functions
dev_get_drvdata() and dev_set_drvdata() should be used.  These functions
have been around since the beginning, so are backwards compatible with
all older kernel versions.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/input/touchscreen/wm97xx-core.c

@@ -569,7 +569,7 @@ static int wm97xx_probe(struct device *dev)
 	mutex_init(&wm->codec_mutex);
 
 	wm->dev = dev;
-	dev->driver_data = wm;
+	dev_set_drvdata(dev, wm);
 	wm->ac97 = to_ac97_t(dev);
 
 	/* check that we have a supported codec */