Fix a typo of comments in AutoVacLauncherMain

Hi,

While reading autovacuum.c, I found the following comments in
AutoVacLauncherMain() right before the call to rebuild_database_list();

         * Create the initial database list.  The invariant we want this list to
         * keep is that it's ordered by decreasing next_time.  As soon as an entry

However, I couldn't fnd any variable named "next_time". I believe it actually refers
to adl_next_worker and the comments should use "next_worker" as is done in other nereby
comments. I've attahed a patch to address this.

Regards,
Yugo Nagata


-- 
Yugo Nagata <nagata@sraoss.co.jp>