Get rid of a //-style comment.

Not sure how "//XXX" got into a committed patch in the first place,
as it's both content-free and against project style.  pgindent made a
bit of a hash of it, too.

Going forward, we should have at least one buildfarm member using
"gcc -ansi" to catch such things, at least till such time as we
decide the project target language isn't C90 any more.  I've turned
this option on on dromedary.

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