fix null pointer dereference in viaExaCheckComposite (patch from Daniel Drake)
fix null pointer dereference in viaExaCheckComposite (patch from Daniel Drake)

freedesktop-unofficial-mirror/openchrome__xf86-video-openchrome,freedesktop-unofficial-mirror/openchrome__xf86-video-openchrome,freedesktop-unofficial-mirror/openchrome__xf86-video-openchrome,freedesktop-unofficial-mirror/openchrome__xf86-video-openchrome