HID: u2fzero: free allocated URB on probe errors

HID: u2fzero: free allocated URB on probe errors

u2fzero_fill_in_urb() allocates dev->urb with usb_alloc_urb(), but
u2fzero_probe() ignored its return value and only freed the URB from
u2fzero_remove().

If LED or hwrng registration fails after the URB allocation, probe returns
an error and the driver core does not call .remove(), leaking the URB. A
failed URB setup was also allowed to continue probing with an unusable
device.

Check the URB setup result and add the missing probe-error unwind so the
URB is freed before returning from later errors.

Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>