PCI: rcar: Fix error handling of irq_of_parse_and_map()

Return value of irq_of_parse_and_map() is unsigned int, with 0 indicating
failure, so testing for negative result never works.

Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Phil Edworthy <phil.edworthy@renesas.com>

drivers/pci/host/pcie-rcar.c

@@ -757,7 +757,7 @@ static int rcar_pcie_get_resources(struct platform_device *pdev,
 		goto err_map_reg;
 
 	i = irq_of_parse_and_map(pdev->dev.of_node, 0);
-	if (i < 0) {
+	if (!i) {
 		dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
 		err = -ENOENT;
 		goto err_map_reg;
@@ -765,7 +765,7 @@ static int rcar_pcie_get_resources(struct platform_device *pdev,
 	pcie->msi.irq1 = i;
 
 	i = irq_of_parse_and_map(pdev->dev.of_node, 1);
-	if (i < 0) {
+	if (!i) {
 		dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
 		err = -ENOENT;
 		goto err_map_reg;