Further adaptation of lfs/_init.lua
Further adaptation of lfs/_init.lua

See https://github.com/nodemcu/nodemcu-firmware/issues/3278 .  Thanks to
@vsky279 and @bazooka07 for suggestions.

FelixPe/nodemcu-firmware,HEYAHONG/nodemcu-firmware,eku/nodemcu-firmware,nodemcu/nodemcu-firmware,eku/nodemcu-firmware,nodemcu/nodemcu-firmware,vsky279/nodemcu-firmware,eku/nodemcu-firmware,nodemcu/nodemcu-firmware,vsky279/nodemcu-firmware,vsky279/nodemcu-firmware,vsky279/nodemcu-firmware,eku/nodemcu-firmware,FelixPe/nodemcu-firmware,vsky279/nodemcu-firmware,HEYAHONG/nodemcu-firmware,HEYAHONG/nodemcu-firmware,nodemcu/nodemcu-firmware,FelixPe/nodemcu-firmware,HEYAHONG/nodemcu-firmware,FelixPe/nodemcu-firmware,FelixPe/nodemcu-firmware,HEYAHONG/nodemcu-firmware,nodemcu/nodemcu-firmware