of_serial: 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: Benjamin Herrenschmidt <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Acked-by: Stephen Rothwell <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Matthias Fuchs <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/serial/of_serial.c

···
 
 	info->type = port_type;
 	info->line = ret;
-	ofdev->dev.driver_data = info;
+	dev_set_drvdata(&ofdev->dev, info);
 	return 0;
 out:
 	kfree(info);
···
  */
 static int of_platform_serial_remove(struct of_device *ofdev)
 {
-	struct of_serial_info *info = ofdev->dev.driver_data;
+	struct of_serial_info *info = dev_get_drvdata(&ofdev->dev);
 	switch (info->type) {
 #ifdef CONFIG_SERIAL_8250
 	case PORT_8250 ... PORT_MAX_8250: