that doesn't have any code that needs to be called as a part of
.remove. Add code to make .remove optional.

Cc: linux-kernel@vger.kernel.org
Cc: linux-serial@vger.kernel.org
Cc: Rob Herring <robh@kernel.org>
Cc: cphealy@gmail.com
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Cc: Lee Jones <redacted>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Pavel Machek <redacted>
Cc: Andy Shevchenko <redacted>
Cc: Johan Hovold <johan@kernel.org>
Signed-off-by: Andrey Smirnov <redacted>
---
  drivers/tty/serdev/core.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index c68fb3a8ea1c..f500f6a2ca88 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c

@@ -252,8 +252,8 @@ static int serdev_drv_probe(struct device *dev)
  static int serdev_drv_remove(struct device *dev)
  {
  	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
-
-	sdrv->remove(to_serdev_device(dev));
+	if (sdrv->remove)
+		sdrv->remove(to_serdev_device(dev));
  	return 0;
  }