PCI: sky1: Fix missing cleanup of ECAM config on probe failure

[ Upstream commit 72e76b6 ]

When devm_kzalloc() for reg_off fails, the code returns -ENOMEM without
freeing pcie->cfg, which was allocated earlier by pci_ecam_create().

Add the missing pci_ecam_free() call to properly release the allocated ECAM
configuration window on this error path.

Fixes: a0d9f2c ("PCI: sky1: Add PCIe host support for CIX Sky1")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Hans Zhang <18255117159@163.com>
Link: https://patch.msgid.link/20260324-sky1-v1-1-6a00cb2776b6@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: outman119

drivers/pci/controller/cadence/pci-sky1.c

@@ -176,8 +176,10 @@ static int sky1_pcie_probe(struct platform_device *pdev)
 	cdns_pcie->is_rc = 1;
 
 	reg_off = devm_kzalloc(dev, sizeof(*reg_off), GFP_KERNEL);
-	if (!reg_off)
+	if (!reg_off) {
+		pci_ecam_free(pcie->cfg);
 		return -ENOMEM;
+	}
 
 	reg_off->ip_reg_bank_offset = SKY1_IP_REG_BANK;
 	reg_off->ip_cfg_ctrl_reg_offset = SKY1_IP_CFG_CTRL_REG_BANK;