Correct typo in comment for out parameter of inverlut() and remove some trailing whitespace
Correct typo in comment for out parameter of inverlut() and remove some trailing whitespace

jcupitt/libvips,lovell/libvips,lovell/libvips,lovell/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips,jcupitt/libvips