plperl spi_exec_query patch

The following patch applies a change I inadvertantly left out of the
previous patch, and makes spi_exec_query work correctly in the case of a
select query.
Test shows:
CREATE TABLE test (
i int,
v varchar
);
CREATE TABLE

INSERT INTO test (i, v) VALUES (1,'first line');
INSERT 25616 1
INSERT INTO test (i, v) VALUES (2,'second line');
INSERT 25617 1
INSERT INTO test (i, v) VALUES (3,'third line');
INSERT 25618 1
INSERT INTO test (i, v) VALUES (4,'immortal');
INSERT 25619 1
create function test_munge() returns setof test language plperl as $$

my $res = [];
my $rv = spi_exec_query("select i,v from plperltest.test;");
my $status = $rv->{status};
my $rows = @{$rv->{rows}};
my $processed = $rv->{processed};
foreach my $rn (0..$rows-1)
{
my $row = $rv->{rows}[$rn];
$row->{i} += 200 if defined($row->{i});
$row->{v} =~ tr/A-Za-z/a-zA-Z/ if (defined($row->{v}));
push @$res,$row;
}
return $res;
$$;
CREATE FUNCTION
select * from test_munge();
i | v
-----+-------------
201 | FIRST LINE
202 | SECOND LINE
203 | THIRD LINE
204 | IMMORTAL
(4 rows)

cheers

andrew