py/objint_mpz: Refactor switch-statement to remove unreachable default.
py/objint_mpz: Refactor switch-statement to remove unreachable default.

henriknelson/micropython,adafruit/micropython,infinnovation/micropython,Peetz0r/micropython-esp32,adafruit/circuitpython,MrSurly/micropython-esp32,tobbad/micropython,lowRISC/micropython,mhoffma/micropython,blazewicz/micropython,hiway/micropython,HenrikSolver/micropython,torwag/micropython,MrSurly/micropython-esp32,SHA2017-badge/micropython-esp32,swegener/micropython,pozetroninc/micropython,lowRISC/micropython,pramasoul/micropython,henriknelson/micropython,kerneltask/micropython,pozetroninc/micropython,mhoffma/micropython,adafruit/circuitpython,puuu/micropython,alex-robbins/micropython,chrisdearman/micropython,tobbad/micropython,toolmacher/micropython,chrisdearman/micropython,TDAbboud/micropython,Timmenem/micropython,bvernoux/micropython,AriZuu/micropython,cwyark/micropython,bvernoux/micropython,infinnovation/micropython,chrisdearman/micropython,adafruit/circuitpython,AriZuu/micropython,lowRISC/micropython,torwag/micropython,deshipu/micropython,infinnovation/micropython,MrSurly/micropython,HenrikSolver/micropython,micropython/micropython-esp32,bvernoux/micropython,AriZuu/micropython,oopy/micropython,Peetz0r/micropython-esp32,bvernoux/micropython,MrSurly/micropython,TDAbboud/micropython,HenrikSolver/micropython,mhoffma/micropython,adafruit/micropython,torwag/micropython,cwyark/micropython,pfalcon/micropython,alex-robbins/micropython,pozetroninc/micropython,MrSurly/micropython-esp32,micropython/micropython-esp32,trezor/micropython,ryannathans/micropython,torwag/micropython,pfalcon/micropython,adafruit/micropython,tralamazza/micropython,selste/micropython,tobbad/micropython,kerneltask/micropython,dmazzella/micropython,dmazzella/micropython,pramasoul/micropython,alex-robbins/micropython,pfalcon/micropython,pozetroninc/micropython,Peetz0r/micropython-esp32,MrSurly/micropython,puuu/micropython,selste/micropython,deshipu/micropython,PappaPeppar/micropython,swegener/micropython,micropython/micropython-esp32,HenrikSolver/micropython,MrSurly/micropython-esp32,infinnovation/micropython,SHA2017-badge/micropython-esp32,alex-robbins/micropython,kerneltask/micropython,swegener/micropython,blazewicz/micropython,ryannathans/micropython,pramasoul/micropython,lowRISC/micropython,MrSurly/micropython,PappaPeppar/micropython,ryannathans/micropython,blazewicz/micropython,puuu/micropython,tralamazza/micropython,tralamazza/micropython,puuu/micropython,kerneltask/micropython,cwyark/micropython,adafruit/micropython,infinnovation/micropython,bvernoux/micropython,Peetz0r/micropython-esp32,PappaPeppar/micropython,adafruit/circuitpython,AriZuu/micropython,deshipu/micropython,swegener/micropython,dmazzella/micropython,tralamazza/micropython,oopy/micropython,hiway/micropython,ryannathans/micropython,tobbad/micropython,toolmacher/micropython,TDAbboud/micropython,cwyark/micropython,MrSurly/micropython,pramasoul/micropython,deshipu/micropython,Timmenem/micropython,lowRISC/micropython,hiway/micropython,pramasoul/micropython,PappaPeppar/micropython,selste/micropython,SHA2017-badge/micropython-esp32,henriknelson/micropython,hiway/micropython,kerneltask/micropython,toolmacher/micropython,oopy/micropython,chrisdearman/micropython,henriknelson/micropython,HenrikSolver/micropython,oopy/micropython,micropython/micropython-esp32,swegener/micropython,adafruit/micropython,pfalcon/micropython,dmazzella/micropython,blazewicz/micropython,SHA2017-badge/micropython-esp32,alex-robbins/micropython,SHA2017-badge/micropython-esp32,deshipu/micropython,micropython/micropython-esp32,TDAbboud/micropython,trezor/micropython,henriknelson/micropython,TDAbboud/micropython,Timmenem/micropython,ryannathans/micropython,trezor/micropython,MrSurly/micropython-esp32,PappaPeppar/micropython,mhoffma/micropython,tobbad/micropython,Timmenem/micropython,Timmenem/micropython,toolmacher/micropython,hiway/micropython,pfalcon/micropython,torwag/micropython,selste/micropython,adafruit/circuitpython,adafruit/circuitpython,mhoffma/micropython,chrisdearman/micropython,trezor/micropython,oopy/micropython,cwyark/micropython,AriZuu/micropython,toolmacher/micropython,blazewicz/micropython,trezor/micropython,pozetroninc/micropython,Peetz0r/micropython-esp32,puuu/micropython,selste/micropython