Simplify help text parsing and _next_line()
Simplify help text parsing and _next_line()

 - _saved_line already handles EOF automagically, so no need to
   special-case it at the end of help text parsing.

 - Check for EOF earlier in _next_line(). Bit silly to do it after line
   joining.

ulfalizer/Kconfiglib,ulfalizer/Kconfiglib