tests/io: Remove "testfile" at end of open_plus test.
tests/io: Remove "testfile" at end of open_plus test.

cwyark/micropython,PappaPeppar/micropython,matthewelse/micropython,alex-march/micropython,mhoffma/micropython,pfalcon/micropython,micropython/micropython-esp32,ganshun666/micropython,lowRISC/micropython,adafruit/micropython,torwag/micropython,emfcamp/micropython,mhoffma/micropython,ryannathans/micropython,mpalomer/micropython,adafruit/circuitpython,tralamazza/micropython,AriZuu/micropython,swegener/micropython,drrk/micropython,dxxb/micropython,bvernoux/micropython,kerneltask/micropython,alex-robbins/micropython,dxxb/micropython,praemdonck/micropython,torwag/micropython,bvernoux/micropython,AriZuu/micropython,micropython/micropython-esp32,dmazzella/micropython,dinau/micropython,hiway/micropython,pozetroninc/micropython,trezor/micropython,matthewelse/micropython,trezor/micropython,infinnovation/micropython,misterdanb/micropython,drrk/micropython,alex-robbins/micropython,dmazzella/micropython,TDAbboud/micropython,tralamazza/micropython,ryannathans/micropython,hiway/micropython,mpalomer/micropython,selste/micropython,micropython/micropython-esp32,MrSurly/micropython,bvernoux/micropython,cwyark/micropython,toolmacher/micropython,PappaPeppar/micropython,redbear/micropython,alex-march/micropython,dmazzella/micropython,pozetroninc/micropython,kerneltask/micropython,pramasoul/micropython,tobbad/micropython,puuu/micropython,oopy/micropython,pfalcon/micropython,TDAbboud/micropython,redbear/micropython,hosaka/micropython,alex-march/micropython,praemdonck/micropython,cwyark/micropython,drrk/micropython,tuc-osg/micropython,SHA2017-badge/micropython-esp32,turbinenreiter/micropython,AriZuu/micropython,hiway/micropython,turbinenreiter/micropython,henriknelson/micropython,deshipu/micropython,torwag/micropython,ryannathans/micropython,pozetroninc/micropython,infinnovation/micropython,swegener/micropython,mpalomer/micropython,blazewicz/micropython,micropython/micropython-esp32,mhoffma/micropython,emfcamp/micropython,selste/micropython,deshipu/micropython,emfcamp/micropython,SHA2017-badge/micropython-esp32,bvernoux/micropython,SHA2017-badge/micropython-esp32,adafruit/micropython,praemdonck/micropython,PappaPeppar/micropython,alex-march/micropython,Peetz0r/micropython-esp32,misterdanb/micropython,blazewicz/micropython,dinau/micropython,pramasoul/micropython,dxxb/micropython,infinnovation/micropython,infinnovation/micropython,cwyark/micropython,infinnovation/micropython,adafruit/circuitpython,tralamazza/micropython,turbinenreiter/micropython,torwag/micropython,lowRISC/micropython,pfalcon/micropython,hosaka/micropython,tobbad/micropython,puuu/micropython,matthewelse/micropython,MrSurly/micropython,toolmacher/micropython,Peetz0r/micropython-esp32,emfcamp/micropython,blazewicz/micropython,turbinenreiter/micropython,micropython/micropython-esp32,Timmenem/micropython,redbear/micropython,Peetz0r/micropython-esp32,dinau/micropython,chrisdearman/micropython,tralamazza/micropython,swegener/micropython,jmarcelino/pycom-micropython,tuc-osg/micropython,chrisdearman/micropython,misterdanb/micropython,MrSurly/micropython,misterdanb/micropython,jmarcelino/pycom-micropython,lowRISC/micropython,alex-robbins/micropython,MrSurly/micropython,deshipu/micropython,HenrikSolver/micropython,puuu/micropython,trezor/micropython,Peetz0r/micropython-esp32,ryannathans/micropython,jmarcelino/pycom-micropython,AriZuu/micropython,ryannathans/micropython,mpalomer/micropython,misterdanb/micropython,trezor/micropython,trezor/micropython,torwag/micropython,pramasoul/micropython,PappaPeppar/micropython,dmazzella/micropython,HenrikSolver/micropython,blazewicz/micropython,SHA2017-badge/micropython-esp32,MrSurly/micropython-esp32,ganshun666/micropython,selste/micropython,toolmacher/micropython,hosaka/micropython,henriknelson/micropython,oopy/micropython,lowRISC/micropython,adafruit/circuitpython,praemdonck/micropython,swegener/micropython,AriZuu/micropython,chrisdearman/micropython,ganshun666/micropython,dinau/micropython,turbinenreiter/micropython,pramasoul/micropython,adafruit/micropython,mhoffma/micropython,matthewelse/micropython,hiway/micropython,PappaPeppar/micropython,jmarcelino/pycom-micropython,MrSurly/micropython-esp32,SHA2017-badge/micropython-esp32,deshipu/micropython,dxxb/micropython,pfalcon/micropython,redbear/micropython,oopy/micropython,Timmenem/micropython,ganshun666/micropython,TDAbboud/micropython,praemdonck/micropython,tuc-osg/micropython,selste/micropython,tuc-osg/micropython,MrSurly/micropython-esp32,bvernoux/micropython,ganshun666/micropython,pozetroninc/micropython,alex-robbins/micropython,dinau/micropython,pfalcon/micropython,drrk/micropython,toolmacher/micropython,HenrikSolver/micropython,HenrikSolver/micropython,puuu/micropython,jmarcelino/pycom-micropython,adafruit/circuitpython,chrisdearman/micropython,puuu/micropython,Timmenem/micropython,matthewelse/micropython,dxxb/micropython,Peetz0r/micropython-esp32,alex-robbins/micropython,tobbad/micropython,matthewelse/micropython,adafruit/micropython,cwyark/micropython,kerneltask/micropython,MrSurly/micropython,tuc-osg/micropython,blazewicz/micropython,lowRISC/micropython,swegener/micropython,hosaka/micropython,mpalomer/micropython,redbear/micropython,alex-march/micropython,tobbad/micropython,mhoffma/micropython,kerneltask/micropython,HenrikSolver/micropython,adafruit/circuitpython,kerneltask/micropython,tobbad/micropython,selste/micropython,emfcamp/micropython,hosaka/micropython,oopy/micropython,Timmenem/micropython,deshipu/micropython,oopy/micropython,chrisdearman/micropython,MrSurly/micropython-esp32,pramasoul/micropython,pozetroninc/micropython,adafruit/micropython,TDAbboud/micropython,MrSurly/micropython-esp32,henriknelson/micropython,toolmacher/micropython,henriknelson/micropython,TDAbboud/micropython,drrk/micropython,henriknelson/micropython,Timmenem/micropython,adafruit/circuitpython,hiway/micropython