powerpc/sysdev/fsl_msi: Add missing of_node_put()

In fsl_setup_msi_irqs(), use of_node_put() to drop the reference
returned by of_parse_phandle().

Fixes: 895d603f ("powerpc/fsl_msi: add support for the fsl, msi property in PCI nodes")
Co-authored-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220704145233.278539-1-windhl@126.com

arch/powerpc/sysdev/fsl_msi.c

@@ -209,8 +209,10 @@ static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 			dev_err(&pdev->dev,
 				"node %pOF has an invalid fsl,msi phandle %u\n",
 				hose->dn, np->phandle);
+			of_node_put(np);
 			return -EINVAL;
 		}
+		of_node_put(np);
 	}
 
 	msi_for_each_desc(entry, &pdev->dev, MSI_DESC_NOTASSOCIATED) {