fix tiff load for plane-separate images
fix tiff load for plane-separate images

need an extra case in geometry sanity check

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