PCI: xilinx-cpm: Fix IRQ domain leak in error path of probe

The IRQ domain allocated for the PCIe controller is not freed if
resource_list_first_type() returns NULL, leading to a resource leak.

This fix ensures properly cleaning up the allocated IRQ domain in
the error path.

Fixes: 49e427e ("Merge branch 'pci/host-probe-refactor'")
Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@amd.com>
[kwilczynski: added missing Fixes: tag, refactored to use one of the goto labels]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Link: https://lore.kernel.org/r/20250224155025.782179-2-thippeswamy.havalige@amd.com

Author: Thippeswamy Havalige

drivers/pci/controller/pcie-xilinx-cpm.c

@@ -583,15 +583,17 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
 		return err;
 
 	bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
-	if (!bus)
-		return -ENODEV;
+	if (!bus) {
+		err = -ENODEV;
+		goto err_free_irq_domains;
+	}
 
 	port->variant = of_device_get_match_data(dev);
 
 	err = xilinx_cpm_pcie_parse_dt(port, bus->res);
 	if (err) {
 		dev_err(dev, "Parsing DT failed\n");
-		goto err_parse_dt;
+		goto err_free_irq_domains;
 	}
 
 	xilinx_cpm_pcie_init_port(port);
@@ -615,7 +617,7 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
 	xilinx_cpm_free_interrupts(port);
 err_setup_irq:
 	pci_ecam_free(port->cfg);
-err_parse_dt:
+err_free_irq_domains:
 	xilinx_cpm_free_irq_domains(port);
 	return err;
 }