i2c: mux: pca954x: Use dev_fwnode()

irq_domain_create_simple() takes fwnode as the first argument. It can be
extracted from the struct device using dev_fwnode() helper instead of
using of_node with of_fwnode_handle(). So use the dev_fwnode() helper.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
[wsa: proper commit header]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Author: Jiri Slaby (SUSE)

drivers/i2c/muxes/i2c-mux-pca954x.c

@@ -442,8 +442,7 @@ static int pca954x_irq_setup(struct i2c_mux_core *muxc)
 
 	raw_spin_lock_init(&data->lock);
 
-	data->irq = irq_domain_create_linear(of_fwnode_handle(client->dev.of_node),
-					     data->chip->nchans,
+	data->irq = irq_domain_create_linear(dev_fwnode(&client->dev), data->chip->nchans,
 					     &irq_domain_simple_ops, data);
 	if (!data->irq)
 		return -ENODEV;