fix the stepgen dithering error reported by Alex Joni
fix the stepgen dithering error reported by Alex Joni

ArcEye/MK-Qt5,ianmcmahon/linuxcnc-mirror,unseenlaser/machinekit,ArcEye/machinekit-testing,cdsteinkuehler/MachineKit,unseenlaser/machinekit,araisrobo/machinekit,ikcalB/linuxcnc-mirror,cdsteinkuehler/MachineKit,mhaberler/machinekit,bmwiedemann/linuxcnc-mirror,cnc-club/linuxcnc,EqAfrica/machinekit,cdsteinkuehler/linuxcnc,mhaberler/machinekit,yishinli/emc2,ArcEye/machinekit-testing,ArcEye/MK-Qt5,Cid427/machinekit,araisrobo/machinekit,RunningLight/machinekit,aschiffler/linuxcnc,unseenlaser/machinekit,bobvanderlinden/machinekit,ianmcmahon/linuxcnc-mirror,unseenlaser/linuxcnc,ArcEye/machinekit-testing,EqAfrica/machinekit,araisrobo/linuxcnc,unseenlaser/linuxcnc,cnc-club/linuxcnc,RunningLight/machinekit,araisrobo/machinekit,unseenlaser/linuxcnc,Cid427/machinekit,unseenlaser/machinekit,narogon/linuxcnc,mhaberler/machinekit,bobvanderlinden/machinekit,cdsteinkuehler/MachineKit,strahlex/machinekit,narogon/linuxcnc,bmwiedemann/linuxcnc-mirror,jaguarcat79/ILC-with-LinuxCNC,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,jaguarcat79/ILC-with-LinuxCNC,jaguarcat79/ILC-with-LinuxCNC,mhaberler/machinekit,cdsteinkuehler/MachineKit,narogon/linuxcnc,Cid427/machinekit,RunningLight/machinekit,EqAfrica/machinekit,bobvanderlinden/machinekit,araisrobo/linuxcnc,unseenlaser/machinekit,Cid427/machinekit,unseenlaser/machinekit,bmwiedemann/linuxcnc-mirror,unseenlaser/machinekit,cnc-club/linuxcnc,narogon/linuxcnc,ianmcmahon/linuxcnc-mirror,ArcEye/machinekit-testing,Cid427/machinekit,unseenlaser/machinekit,jaguarcat79/ILC-with-LinuxCNC,strahlex/machinekit,bobvanderlinden/machinekit,RunningLight/machinekit,cdsteinkuehler/linuxcnc,RunningLight/machinekit,RunningLight/machinekit,bobvanderlinden/machinekit,ArcEye/machinekit-testing,strahlex/machinekit,araisrobo/machinekit,bmwiedemann/linuxcnc-mirror,kinsamanka/machinekit,ikcalB/linuxcnc-mirror,cdsteinkuehler/linuxcnc,ArcEye/MK-Qt5,EqAfrica/machinekit,mhaberler/machinekit,ArcEye/machinekit-testing,araisrobo/machinekit,ikcalB/linuxcnc-mirror,kinsamanka/machinekit,araisrobo/machinekit,Cid427/machinekit,EqAfrica/machinekit,strahlex/machinekit,araisrobo/machinekit,kinsamanka/machinekit,cdsteinkuehler/MachineKit,jaguarcat79/ILC-with-LinuxCNC,strahlex/machinekit,strahlex/machinekit,araisrobo/linuxcnc,mhaberler/machinekit,ArcEye/MK-Qt5,ArcEye/machinekit-testing,cdsteinkuehler/linuxcnc,ArcEye/MK-Qt5,cnc-club/linuxcnc,Cid427/machinekit,araisrobo/machinekit,kinsamanka/machinekit,cnc-club/linuxcnc,ianmcmahon/linuxcnc-mirror,ArcEye/MK-Qt5,bmwiedemann/linuxcnc-mirror,ArcEye/machinekit-testing,yishinli/emc2,strahlex/machinekit,mhaberler/machinekit,kinsamanka/machinekit,ikcalB/linuxcnc-mirror,cdsteinkuehler/linuxcnc,EqAfrica/machinekit,yishinli/emc2,ianmcmahon/linuxcnc-mirror,kinsamanka/machinekit,EqAfrica/machinekit,mhaberler/machinekit,aschiffler/linuxcnc,RunningLight/machinekit,aschiffler/linuxcnc,ArcEye/MK-Qt5,unseenlaser/linuxcnc,bobvanderlinden/machinekit,yishinli/emc2,ianmcmahon/linuxcnc-mirror,ianmcmahon/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,aschiffler/linuxcnc,bobvanderlinden/machinekit,bobvanderlinden/machinekit,araisrobo/linuxcnc,kinsamanka/machinekit,cnc-club/linuxcnc,narogon/linuxcnc,cnc-club/linuxcnc,aschiffler/linuxcnc,ikcalB/linuxcnc-mirror,kinsamanka/machinekit,ArcEye/MK-Qt5,cdsteinkuehler/MachineKit,RunningLight/machinekit,araisrobo/linuxcnc,cdsteinkuehler/linuxcnc,EqAfrica/machinekit,Cid427/machinekit,ikcalB/linuxcnc-mirror,araisrobo/machinekit,unseenlaser/linuxcnc