mission.c: Fix some small errors
mission.c: Fix some small errors

ming6842/firmware,fboris/firmware,ming6842/firmware,ming6842/firmware-new,fboris/firmware,ming6842/firmware-new,UrsusPilot/firmware,UrsusPilot/firmware,ming6842/firmware,fboris/firmware,ming6842/firmware-new,UrsusPilot/firmware