HID: mcp-2221: cancel delayed_work only when CONFIG_IIO is enabled

If the device is unplugged and CONFIG_IIO is not supported, this will
result in a warning message at kernel/workqueue.

Only cancel delayed work in mcp2221_remove(), when CONFIG_IIO is enabled.
Signed-off-by: Abdelrahman Morsy <abdelrahmanhesham94@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

drivers/hid/hid-mcp2221.c

@@ -944,9 +944,11 @@ static void mcp2221_hid_unregister(void *ptr)
 /* This is needed to be sure hid_hw_stop() isn't called twice by the subsystem */
 static void mcp2221_remove(struct hid_device *hdev)
 {
+#if IS_REACHABLE(CONFIG_IIO)
 	struct mcp2221 *mcp = hid_get_drvdata(hdev);
 
 	cancel_delayed_work_sync(&mcp->init_work);
+#endif
 }
 
 #if IS_REACHABLE(CONFIG_IIO)