extmod/modlwip: Use mp_raise_OSError helper function.
extmod/modlwip: Use mp_raise_OSError helper function.

Reduces esp8266 code size by about 230 bytes.

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