HID: intel-ish-hid: Simplify logic in ishtp_cl_device_remove()

There is only a single change in behavior: Now dev->driver isn't modified.
Assigning to this variable is in the domain of the driver core only. (And
it's done in __device_release_driver shortly after bus->remove() (i.e
ishtp_cl_device_remove() here) returns.)
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/intel-ish-hid/ishtp/bus.c

@@ -258,19 +258,17 @@ static int ishtp_cl_device_remove(struct device *dev)
 {
 	struct ishtp_cl_device *device = to_ishtp_cl_device(dev);
 	struct ishtp_cl_driver *driver = to_ishtp_cl_driver(dev->driver);
+	int ret = 0;
 
 	if (device->event_cb) {
 		device->event_cb = NULL;
 		cancel_work_sync(&device->event_work);
 	}
 
-	if (!driver->remove) {
-		dev->driver = NULL;
+	if (driver->remove)
+		ret = driver->remove(device);
 
-		return 0;
-	}
-
-	return driver->remove(device);
+	return ret;
 }
 
 /**