qxl_driver: check_crtc: handle qxl->crtcs == NULL
qxl_driver: check_crtc: handle qxl->crtcs == NULL

fgouget/xf86-video-qxl,facboy/xserver-xorg-video-qxl,facboy/xserver-xorg-video-qxl,facboy/xserver-xorg-video-qxl,fgouget/xf86-video-qxl,facboy/xserver-xorg-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl