staging: octeon-usb: call device_unregister when platform_device_register_simple fails

device_register is called before platform_device_register_simple gets called.
unregister and reset the octeon_usb_registered variable

Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: David Daney <ddaney.cavm@gmail.com>
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/octeon-usb/octeon-hcd.c

@@ -785,6 +785,8 @@ static int __init octeon_usb_module_init(void)
         pdev = platform_device_register_simple((char*)octeon_usb_driver.name, device, &irq_resource, 1);
         if (IS_ERR(pdev)) {
             DEBUG_FATAL("OcteonUSB: Failed to allocate platform device for USB%d\n", device);
+		driver_unregister(&octeon_usb_driver);
+		octeon_usb_registered = 0;
             return PTR_ERR(pdev);
         }
         if (device < MAX_USB_PORTS)