Description:
------------
On my amd64 the following code snippet lead to a warning from glibc, probably double free:
andrey@whirlpool:~/dev/php6$ ./php mysqlnd_local_infile2.php
string(16) "/tmp/test_RS93D8"
done!*** glibc detected *** free(): invalid pointer: 0x00000000007ca1c4 ***
Aborted


Reproduce code:
---------------
<?php
    $file = tempnam(sys_get_temp_dir(), "test_");
    var_dump($file);
    $fp = fopen($file, "w");
    fwrite($fp, "test");
    fclose($fp);

    print "done!";
?>

Expected result:
----------------
string(16) "/tmp/test_RS93D8"
done

Actual result:
--------------
string(16) "/tmp/test_RS93D8"
done!*** glibc detected *** free(): invalid pointer: 0x00000000007ca1c4 ***
Aborted