removed confused nohalo code comment
removed confused nohalo code comment

leiyangyou/libvips,jcupitt/libvips,lovell/libvips,leiyangyou/libvips,wishabi/libvips,jcupitt/libvips,mcanthony/libvips,mcanthony/libvips,leiyangyou/libvips,wishabi/libvips,jcupitt/libvips,mcanthony/libvips,wishabi/libvips,lovell/libvips,lovell/libvips,leiyangyou/libvips,mcanthony/libvips,jcupitt/libvips,wishabi/libvips,lovell/libvips