io: fix a tool number/pocket number bug in EMC_TOOL_SET_NUMBER (M61)
io: fix a tool number/pocket number bug in EMC_TOOL_SET_NUMBER (M61)

Rename a local variable from "number" to "pocket_number", which is more
descriptive, and which highlights a bug in the code.  Fix the bug.

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