rtl818x_pci: Disable pci device in error handling code

When pci_request_regions in rtl8180_probe fails, pci_disable_device is not
called to disable the device which is enabled by pci_enbale_device.

This patch fixes the problem by adding a new lable in error handling code.
Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
Acked-by: Andrea Merello <andrea.merello@gmail.com>
Signed-off-by: Julian Calaby <julian.calaby@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c

@@ -1736,7 +1736,7 @@ static int rtl8180_probe(struct pci_dev *pdev,
 	if (err) {
 		printk(KERN_ERR "%s (rtl8180): Cannot obtain PCI resources\n",
 		       pci_name(pdev));
-		return err;
+		goto err_disable_dev;
 	}
 
 	io_addr = pci_resource_start(pdev, 0);
@@ -1938,6 +1938,8 @@ static int rtl8180_probe(struct pci_dev *pdev,
 
  err_free_reg:
 	pci_release_regions(pdev);
+
+ err_disable_dev:
 	pci_disable_device(pdev);
 	return err;
 }