[PATCH] Fix manual binding infinite loop

Fix for manual binding of drivers to devices. Problem is if you pass in
a valid device id, but the driver refuses to bind. Infinite loop as
write() tries to resubmit the data it just sent.

Thanks to Michal Ostrowski <[e-mail]> for pointing the
problem out.

Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/bus.c

···
 		device_release_driver(dev);
 		err = count;
 	}
-	return err;
+	if (err)
+		return err;
+	return count;
 }
 static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind);