iio: backend: fix wrong pointer passed to IS_ERR()

It should be fwnode_back passed to IS_ERR().

Fixes: c464cc6 ("iio: add child nodes support in iio backend framework")
Signed-off-by: Yang Yingliang <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

Author: Yang Yingliang

drivers/iio/industrialio-backend.c

@@ -737,8 +737,8 @@ static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, con
 	}
 
 	fwnode_back = fwnode_find_reference(fwnode, "io-backends", index);
-	if (IS_ERR(fwnode))
-		return dev_err_cast_probe(dev, fwnode,
+	if (IS_ERR(fwnode_back))
+		return dev_err_cast_probe(dev, fwnode_back,
 					  "Cannot get Firmware reference\n");
 
 	guard(mutex)(&iio_back_lock);