HID: lenovo-go: drop dead NULL check on to_usb_interface()

HID: lenovo-go: drop dead NULL check on to_usb_interface()

to_usb_interface() is a container_of_const() macro: it performs
pointer arithmetic and never returns NULL. The if (!intf) and if
(intf) tests in get_endpoint_address() can never fire. Remove them
in both drivers.

No functional change.

Suggested-by: Derek J. Clark <derekjohn.clark@gmail.com>
Signed-off-by: Louis Clinckx <clinckx.louis@gmail.com>
Reviewed-by: Derek J. Clark <derekjoh.clark@gmail.com>
Tested-by: Derek J. Clark <derekjohn.clark@gmail.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>