PCI: xilinx-nwl: Fix platform_get_irq() error handling

When platform_get_irq() fails we should propagate the real error value
instead of always returning -EINVAL.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Michal Simek <michal.simek@xilinx.com>

drivers/pci/host/pcie-xilinx-nwl.c

@@ -812,7 +812,7 @@ static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
 	pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
 	if (pcie->irq_intx < 0) {
 		dev_err(dev, "failed to get intx IRQ %d\n", pcie->irq_intx);
-		return -EINVAL;
+		return pcie->irq_intx;
 	}
 
 	irq_set_chained_handler_and_data(pcie->irq_intx,