there is a typo error in SDL/src/joystick/wiiu/SDL_wiiujoystick.c:line 458:

x1 = (int16_t) ((kpad.nunchunk.stick.x) * 0x7ff0);
y1 = (int16_t) -((kpad.nunchunk.stick.y) * 0x7ff0);

As WUT CHANGELOG.md indicates rename nunchunk to nunchuk in order to fix it.