PCI: rockchip: Fix a leaked reference by adding missing of_node_put()

The call to of_get_child_by_name() returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

irq_domain_add_linear() also calls of_node_get() to increase refcount,
so irq_domain will not be affected when it is released.

Detected by coccinelle with the following warnings:
./drivers/pci/controller/pcie-rockchip-host.c:729:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 718, but without a corresponding object release within this function.
./drivers/pci/controller/pcie-rockchip-host.c:732:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 718, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <[e-mail]>
Signed-off-by: Lorenzo Pieralisi <[e-mail]>
Cc: Shawn Lin <[e-mail]>
Cc: Lorenzo Pieralisi <[e-mail]>
Cc: Bjorn Helgaas <[e-mail]>
Cc: Heiko Stuebner <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]

drivers/pci/controller/pcie-rockchip-host.c

···
 
 	rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
 						    &intx_domain_ops, rockchip);
+	of_node_put(intc);
 	if (!rockchip->irq_domain) {
 		dev_err(dev, "failed to get a INTx IRQ domain\n");
 		return -EINVAL;