Description:
------------
PHP (debug build) detects memory leaks on this environment.
 - Linux Cent OS 5.3 (64bit)
 - unixODBC-2.2.15pre
 - Oracle instantclient 11.1

This occurs only when fetching Oracle "TIMESTANP" column on Linux.

Reproduce code:
---------------
<?php
$dsn  = "VALID_DATA_SOURCE_NAME";
$user = "VALID_USER_NAME";
$pass = "VALID_PASSWORD";
$conn = odbc_connect($dsn, $user, $pass);

// sample table has this schema and has more than one row(s).
//     CREATE TABLE TEST (COLUMN1 TIMESTAMP)
$ret = odbc_exec($conn, "SELECT COLUMN1 FROM TEST");

// Here detects leaking memory!! And, data seems normal state.
$data = odbc_result($ret, 1);
var_dump($data);

odbc_close($conn);

Actual result:
--------------
string(26) "2009-11-13 00:00:00.000000"
[Fri Nov 13 13:06:27 2009]  Script:  '/home/cybozu/oracle_timestamp.php'
---------------------------------------
/home/cybozu/tmp/php/ext/odbc/php_odbc.c(429) : Block 0x04ae49a8 status:
Beginning:      OK (allocated on /home/cybozu/tmp/php/ext/odbc/php_odbc.c:984, 27 bytes)
    Start:      OK
      End:      Overflown (magic=0x00000030 instead of 0x6C71D1A1)
                3 byte(s) overflown
---------------------------------------
[Fri Nov 13 13:06:27 2009]  Script:  '/home/cybozu/oracle_timestamp.php'
/home/cybozu/tmp/php/ext/odbc/php_odbc.c(984) :  Freeing 0x04AE49A8 (27 bytes), script=/home/cybozu/oracle_timestamp.php
=== Total 1 memory leaks detected ===