HID: thrustmaster: fix return value check in thrustmaster_probe()

Fix the return value check which testing the wrong variable
in thrustmaster_probe().

Fixes: c49c3363

 ("HID: support for initialization of some Thrustmaster wheels")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-thrustmaster.c

@@ -312,7 +312,7 @@ static int thrustmaster_probe(struct hid_device *hdev, const struct hid_device_i
 	}
 
 	tm_wheel->change_request = kzalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
-	if (!tm_wheel->model_request) {
+	if (!tm_wheel->change_request) {
 		ret = -ENOMEM;
 		goto error5;
 	}