testsuite: fix overrun test
testsuite: fix overrun test

the overrun test should exit with 0 when runtests detected the
artificial overrun error, and exit with 0 otherwise.

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