Otherwise, the feed may be overwritten, but if it is shorter, it may
contain some leftover data from a previous run. In that case, the file
will be invalid XML, thereby failing to be parsed.
Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>
Instead of hardcoding the feed file name to be feed.atom, it has been
configurable for a while. This is now also reflected in the feed itself.
Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>