Tomeu prefers ' for strings, so let's use it wherever we don't have a good
reason to use ".
Reviewed-by: James Cameron <quozl@laptop.org>
Acked-by: Simon Schampijer <simon@laptop.org>
CC: Aleksey Lim <alsroot@member.fsf.org>
self._cleanup does the self._file.close() anyway if the file exists.
The self._file.close() removed here is redundant, and will always
fail on file not found, which is handled in send_head by returning
None for self._file.