Get rid of the excess semicolon in planner.c

[Richard Guo]

I think this is a typo introduced in 0452b461b.

 +    root->processed_groupClause = list_copy(parse->groupClause);;

The extra empty statement is harmless in most times, but I still think
it would be better to get rid of it.

Attached is a trivial patch to do that.

Thanks
Richard

v1-0001-Get-rid-of-the-excess-semicolon-in-planner.c.patch
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