Return value of file.close and os.execute is incorrect

[lolleko]

File close should return the same as os.execute if the file was opened via popen.
os.execute should return a tuple see manual for more information.

http://www.lua.org/manual/5.2/manual.html#pdf-file:close
http://www.lua.org/manual/5.2/manual.html#pdf-os.execute