How to fix set-valued function called in context that cannot accept a set in earlier versions

["Andrus" <kobruleht2@xxxxxx>]

In 8.3 code below causes exception

ERROR:  set-valued function called in context that cannot accept a set
CONTEXT:  PL/pgSQL function "wordwrap" line 21 at RETURN NEXT

How to fix this so that wordwrap works in any PostgreSql 8.x version or at 
least in
8.3 and 8.4 ?

Andrus

CREATE OR REPLACE FUNCTION wordwrap(line text, linelen integer)
RETURNS SETOF text as $$
DECLARE
 words text[] := string_to_array(line,' ');
 i integer;
 res text:='';

BEGIN
 if trim(line)='' then
   return next '';
   return;
   end if;
for i IN 1 .. array_upper(words,1) LOOP
  if length(res)+length(words[i]) > linelen THEN
    return next res;
    res := '';
    END IF ;
  if res<>'' then
    res := res || ' ';
    end if;
  res := res || words[i];
  end loop;
return next res;
END
$$ LANGUAGE plpgsql;

select wordwrap('fdgdf',10) 


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