apply the right separator for concat

lib/ed.lua

@@ -123,7 +123,7 @@ function ed.open(buffer)
  end
  if type(buffer) ~= "table" then buffer = ed.newBuffer() end
  buffer[1] = buffer[1] or "" 
- buffer.path = buffer.path or "/"..((bpath:sub(1,1) == "/" and table.concat(fs.segments(path),"/")) or table.concat(fs.segments(os.getenv("PWD").."/"..bpath)))
+ buffer.path = buffer.path or "/"..((bpath:sub(1,1) == "/" and table.concat(fs.segments(path),"/")) or table.concat(fs.segments(os.getenv("PWD").."/"..bpath,"/")))
  return buffer
 end