nubus: Simplify check in remove callback

The driver core only calls a remove callback when the device was
successfully bound (aka probed) before. So dev->driver is never NULL and
the respective check can just be dropped.

Acked-by: Finn Thain <[e-mail]>
Signed-off-by: Uwe Kleine-König <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/nubus/bus.c

···
 {
 	struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
 
-	if (dev->driver && ndrv->remove)
+	if (ndrv->remove)
 		ndrv->remove(to_nubus_board(dev));
 }