missing return in function

neosensor/libraries/neocampus_drivers/TM1637Display.cpp

neosensor/libraries/neocampus_drivers/TM1637Display.h

neosensor/libraries/neocampus_modules/display.cpp

neosensor/libraries/neocampus_modules/display.h

neosensor/libraries/neocampus_modules/neoclock.cpp

neosensor/libraries/neocampus_modules/neoclock.h

neosensor/libraries/neocampus_modules/noise.cpp