firewire: remove support of fw_driver.driver.probe and .remove methods

After all IEEE 1394 high-level drivers being converted to bus-specific
.probe/.remove methods, remove support of the obsolete generic methods.

Signed-off-by: Stefan Richter <[e-mail]>

drivers/firewire/core-device.c

···
 	struct fw_driver *driver =
 			container_of(dev->driver, struct fw_driver, driver);
 
-	if (driver->probe)
-		return driver->probe(fw_unit(dev), unit_match(dev, dev->driver));
-	else
-		return driver->driver.probe(dev);
+	return driver->probe(fw_unit(dev), unit_match(dev, dev->driver));
 }
 
 static int fw_unit_remove(struct device *dev)
···
 	struct fw_driver *driver =
 			container_of(dev->driver, struct fw_driver, driver);
 
-	if (driver->remove)
-		return driver->remove(fw_unit(dev)), 0;
-	else
-		return driver->driver.remove(dev);
+	return driver->remove(fw_unit(dev)), 0;
 }
 
 static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)