mailbox: 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) <[e-mail]>
Cc: Manivannan Sadhasivam <[e-mail]>
Cc: Jassi Brar <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

drivers/mailbox/qcom-ipcc.c

···
 	if (!name)
 		return -ENOMEM;
 
-	ipcc->irq_domain = irq_domain_create_tree(of_fwnode_handle(pdev->dev.of_node),
-						  &qcom_ipcc_irq_ops, ipcc);
+	ipcc->irq_domain = irq_domain_create_tree(dev_fwnode(&pdev->dev), &qcom_ipcc_irq_ops, ipcc);
 	if (!ipcc->irq_domain)
 		return -ENOMEM;