Remove unused variable

The variable became obsolete in commit
68739ba, but only gcc 4.6 shows the
warning.

Author: petere

src/backend/parser/parse_utilcmd.c

@@ -845,7 +845,6 @@ static void
 transformOfType(CreateStmtContext *cxt, TypeName *ofTypename)
 {
 	HeapTuple	tuple;
-	Form_pg_type typ;
 	TupleDesc	tupdesc;
 	int			i;
 	Oid			ofTypeId;
@@ -854,7 +853,6 @@ transformOfType(CreateStmtContext *cxt, TypeName *ofTypename)
 
 	tuple = typenameType(NULL, ofTypename, NULL);
 	check_of_type(tuple);
-	typ = (Form_pg_type) GETSTRUCT(tuple);
 	ofTypeId = HeapTupleGetOid(tuple);
 	ofTypename->typeOid = ofTypeId;		/* cached for later */