qxl_driver: simplify calling qxl_update_monitors_config
qxl_driver: simplify calling qxl_update_monitors_config

Simplify by calling check_crtc from within qxl_update_monitors_config,
instead of calling check_crtc before every call to
qxl_update_monitors_config.

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